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Optimasi Proses Hidrolisis Vinasse Sebagai Bahan Baku Resin Polimer yang Ramah Lingkungan Saputri, Lestari Hetalesi
CHEMICA: Jurnal Teknik Kimia Vol 3, No 1 (2016): Juni 2016
Publisher : Universitas Ahmad Dahlan

Vinasse contains some amine, carboxyl and hydroxyl groups in itâs organic acids. These groups when being combined with other materials can be synthesized into a raw material of coating material. This research aims to break vinasse chain by hydrolysis into amino acids. Hydrolysis is carried out at 110 Â°CÂ with a residence time of 60-150 minutes (with 30-minute intervals). In addition, the comparison between the volume of vinasse and HCl isÂ 1: 1, 1: 2, 1: 3 and 1: 4. Then the material from the hydrolysis are analyzed their groups. Quantitative analysis is required to determine the composition of vinasse that will be added in the next polimerization processing. The result showed that the optimum conditions of hydrolysis process is at 2 hours and volume HCl with the ratio of 1: 3. FTIR analysis indicated the presence of carboxyl and amines groups on hydrolyzate. The long termÂ goal of this research is the use of vinasse as a coating material derived from biomaterials, as well as renewable materials. It could be expected that hydrolysis under acidic conditions can be an initial step to a coating material with vinasse as a raw material base.Â Keywords: Â Vinasse, Polimer Resin, Hydrolysis, Coating Material.

Kinetika Reaksi Poliesterifikasi Hidrolisat Shellac dan Anhidrida Ftalat Ditinjau Dari Reaktivitas Gugus Hidroksil Saputri, Lestari Hetalesi; Rochmadi, Rochmadi; Budhijanto, Budhijanto
CHEMICA: Jurnal Teknik Kimia Vol 2, No 2 (2015): Desember 2015
Publisher : Universitas Ahmad Dahlan

This research presents polyesterification kinetics for shellac hydrolizate-phtalic anhydride. The polyesterification kinetics is proposed by assuming that the reaction Â in ideal system, whereas the reactivity of the OH groups are considered different. Polyesterification was started from purification of shelllac by hydrolisis process. Hydrolisis was done by dissolving seedlac into NaOH solution and acidification with HCl. Polyesterification was conducted by reacting shellac hydrolizate with phtalic anhydride. Both of these materials were reacted in a three necked flask under vacuum condition. The reaction was conducted in temperature range of 130-170 0C and samples were taken every 30 minutes for a total of 5 hours, to determine the COOH concentration by titration. The investigation of reaction kinetic showed that reaction model Â could describe the kinetic of polyesterification shellac hydrolizate-phthalic anhydride, especially for temperature below 150 0C. The reaction rate constants were obtained as follows:k1 = 19.7 e (-3802.82/T) g/mgek.menitk2 = 29.4 e (-4062.30/T) g/mgek.menit

Pengaruh Proses Blending dan Ultrasonikasi terhadap Struktur Morfologi Ekstrak Serat Limbah Batang Kelapa Sawit untuk Bahan Baku Bioplastik (Selulosa Asetat) Saputri, Lestari Hetalesi; Sukmawan, Romi
Rekayasa Vol 13, No 1: April 2020
Publisher : Universitas Trunojoyo Madura

Batang kelapa sawit (BKS) hasil dari kegiatan replanting merupakan limbah bagi lingkungan apabila dibiarkan begitu saja di areal perkebunan. Padahal limbah ini mengandung selulosa cukup tinggi yang senyawa turunannya dapat diolah lebih lanjut, salah satunya menjadi bahan baku bioplastik yaitu selulosa asetat. Selulosa dapat diisolasi melalui tahapan proses chemis (ekstraksi) dan mekanis (misalnya blending dan ultrasonikasi). Penelitian ini bertujuan untuk mengetahui pengaruh masing-masing tahapan proses tersebut, terutama proses blending dan ultrasonikasi terhadap perubahan sifat morfologi serat limbah BKS. Proses ekstraksi menggunakan NaOH dan H2O2 5%, proses blending menggunakan PHILIPS HR2096 kecepatan 21.000 rpm dan proses sonikasi menggunakan ultrasonic cell crusher. Hasil analisa FTIR setelah proses ekstraksi menunjukkan bahwa terdapat adanya ikatan O-H, C-H dan C-O pada puncak gelombang 3410,15; 2908,65 dan 1033,85 cm-1 yang merupakan ikatan penyusun gugus utama senyawa selulosa. Hasil XRD memperlihatkan terjadi penurunan derajat kristalin sebelum dan setelah proses blending yaitu sebesar 18,26%. Namun setelah proses ultrasonikasi terjadi kenaikan kembali nilai derajat kristalin dari 21,09% menjadi 30%. Karakterisasi morfologi menunjukkan bahwa proses blending dapat memisahkan struktur amorf dari serat selulosa dan proses ultrasonikasi dapat memecah serat selulosa menjadi lebih kecil. Dari penelitian ini dapat disimpulkan bahwa proses blending dan ultrasonikasi mempengaruhi perubahan struktur dan morfologi serat selulosa hasil ekstrak limbah BKS, namun penelitian ini masih perlu dikembangkan untuk mengetahui kondisi proses yang tepat untuk menghasilkan serat nanoselulosa yang lebih banyak. Kondisi proses tersebut terutama yang berkaitan dengan kecepatan putar dan waktu tinggal selama proses.The Effect of Blending and Ultrasonication Processes on The Morphological Structure of Palm Oil Trunk Extracts for Raw Material of Bioplastic (Cellulose Acetate)Oil Palm Trunks (OPT) is waste generated from replanting activities that if left in the environment can pollute the plantation area. However, this waste has high cellulose content including its derivative compounds which can be further processed into new products, one of which is a bioplastic raw material, cellulose acetate. Cellulose can be isolated through two processes, which consist of chemical (by extraction) and mechanical (by blending and ultrasonication) processes. This research studies the effects of each stage process, especially the main effects of the blending and ultrasonication processes on the morphological characteristics of palm oil trunk wastes. The extraction process uses NaOH 5% and H2O2 5%, the blending uses PHILIPS HR 2096 with a speed of 21,000 rpm and the sonication process uses an ultrasonic cell crusher. The results of FTIR analysis after the extraction process showed O-H, C-H and C-O bonds at the wave peak of 3410.15; 2908.65 and 1033.85 cm-1, which are the main constituent groups of cellulose compounds. The results of XRD analysis showed a decrease in the degree of crystalline of 18.26% after the blending process. However, after the ultrasonication process, the degree of crystalline increased from 21.09% to 30%. Morphological characterization shows that blending can separate the amorphous structure of cellulose fibers and the ultrasonication process can break down cellulose fibers into smaller sizes. This research still needs to be developed in determining the exact operating conditions to produce nanocellulose fibers, especially those related to rotational speed and residence time during the process.Keywords: The degree of crystalline, extraction, nanocellulose, cellulose

Pengaruh cara pemberian pupuk organik cair vinasse terhadap pertumbuhan awal bawang dayak (Eleutherine palmifolia) Rina Ekawati; Lestari Hetalesi Saputri
Kultivasi Vol 17, No 3 (2018)
Publisher : Universitas Padjadjaran

Sari. Pupuk organik bermanfaat untuk meningkatkan kandungan hara, bahan organik tanah, serta memperbaiki sifat fisik, kimia, dan biologi tanah. Vinasse merupakan limbah dari proses pembuatan bioetanol pada industri pengolahan gula, jika telah mengalami proses pengomposan dapat digunakan sebagai pupuk organik cair (POC) vinasse yang dapat meningkatkan pertumbuhan tanaman. Bawang dayak merupakan salah satu tanaman hortikultura yang dapat dijadikan sebagai tanaman berkhasiat obat. Penelitian ini bertujuan untuk mempelajari pengaruh cara pemberian pupuk organik cair vinasse terhadap pertumbuhan awal tanaman bawang dayak. Percobaan ini dilakukan di Politeknik Lembaga Pendidikan Perkebunan (LPP) Yogyakarta, dari bulan Juli hingga November 2018. Penelitian ini menggunakan rancangan acak kelompok sederhana dengan empat perlakuan, yaitu tanpa pupuk cair, pupuk organik cair pembanding melalui daun, pupuk cair vinasse melalui daun, dan pupuk cair vinasse melalui tanah. Setiap perlakuan diulang tiga kali. Hasil penelitian menunjukkan bahwa cara pemberian pupuk organik cair vinasse tidak berpengaruh terhadap pertumbuhan tanaman bawang dayak (tinggi tanaman maupun jumlah daun) hingga umur tanaman 6,7 dan 8 MST).Kata kunci: bawang dayak, cara aplikasi, pupuk cair, vinasseAbstract. Organic fertilizer can be used to increase nutrient content and soil organic matter. Vinasse is one of sugarcane processing liquid waste. Vinasse can be used as liquid organic fertilizer by composting process and can influence of the plant growth. Eleutherine palmifolia is a functional vegetable that can used as medicinal plant for cancer diseases. This research was aimed to provide information about the effect of organic fertilizer from vinasse waste on the early growth of Eleutherine palmifolia. This experiment was conducted at Politeknik LPP Yogyakarta, from July to November 2018. It used randomized block design with single factor with four treatments (without organic fertilizer; commercial liquid organic fertilizer; vinasse by foliar application; and vinasse by soil application). Each treatment was repeated three times. The result showed that application method of vinasse liquid organic fertilizer was not affected on early growth of Eleutherine palmifolia (plant height and number of leaf) at 6, 7 and 8 weeks after planting.Keywords: application method, Eleutherine palmifolia, liquid fertilizer, vinasse

Optimasi Proses Hidrolisis Vinasse Sebagai Bahan Baku Resin Polimer yang Ramah Lingkungan Lestari Hetalesi Saputri
CHEMICA: Jurnal Teknik Kimia Vol 3, No 1 (2016): Juni 2016
Publisher : Universitas Ahmad Dahlan

Vinasse contains some amine, carboxyl and hydroxyl groups in itâ€™s organic acids. These groups when being combined with other materials can be synthesized into a raw material of coating material. This research aims to break vinasse chain by hydrolysis into amino acids. Hydrolysis is carried out at 110 Â°CÂ with a residence time of 60-150 minutes (with 30-minute intervals). In addition, the comparison between the volume of vinasse and HCl isÂ 1: 1, 1: 2, 1: 3 and 1: 4. Then the material from the hydrolysis are analyzed their groups. Quantitative analysis is required to determine the composition of vinasse that will be added in the next polimerization processing. The result showed that the optimum conditions of hydrolysis process is at 2 hours and volume HCl with the ratio of 1: 3. FTIR analysis indicated the presence of carboxyl and amines groups on hydrolyzate. The long termÂ goal of this research is the use of vinasse as a coating material derived from biomaterials, as well as renewable materials. It could be expected that hydrolysis under acidic conditions can be an initial step to a coating material with vinasse as a raw material base.Â Keywords: Â Vinasse, Polimer Resin, Hydrolysis, Coating Material.

Kinetika Reaksi Poliesterifikasi Hidrolisat Shellac dan Anhidrida Ftalat Ditinjau Dari Reaktivitas Gugus Hidroksil Lestari Hetalesi Saputri; Rochmadi Rochmadi; Budhijanto Budhijanto
CHEMICA: Jurnal Teknik Kimia Vol 2, No 2 (2015): Desember 2015
Publisher : Universitas Ahmad Dahlan

This research presents polyesterification kinetics for shellac hydrolizate-phtalic anhydride. The polyesterification kinetics is proposed by assuming that the reaction Â in ideal system, whereas the reactivity of the OH groups are considered different. Polyesterification was started from purification of shelllac by hydrolisis process. Hydrolisis was done by dissolving seedlac into NaOH solution and acidification with HCl. Polyesterification was conducted by reacting shellac hydrolizate with phtalic anhydride. Both of these materials were reacted in a three necked flask under vacuum condition. The reaction was conducted in temperature range of 130-170 0C and samples were taken every 30 minutes for a total of 5 hours, to determine the COOH concentration by titration. The investigation of reaction kinetic showed that reaction model Â could describe the kinetic of polyesterification shellac hydrolizate-phthalic anhydride, especially for temperature below 150 0C. The reaction rate constants were obtained as follows:k1 = 19.7 e (-3802.82/T) g/mgek.menitk2 = 29.4 e (-4062.30/T) g/mgek.menit

Polyesterification of Shellac as An Alternative Coating Material Lestari Hetalesi Saputri; Rochmadi Rochmadi; Budhijanto Budhijanto
Prosiding Seminar Nasional Teknik Kimia "Kejuangan" 2016: Prosiding SNTKK 2016
Publisher : Seminar Nasional Teknik Kimia Kejuangan

Show Abstract | Download Original | Original Source | Check in Google Scholar

Polyester resin is a type of polyester that is widely used in daily life, such as for paints, coating, composite matrix and so on. However, the widely used is a synthetic resin polyester. They have durable properties and extremely difficult to be degraded. While, the natural polyesters have weakness in their mechanical properties. This research aimed to modify shellac, one of natural polyesters, with phtalic anhydride in order to improve properties of coating material. The Addition of phtalic anhydride is expected to increase the hardness so that is not easily broken. FTIR analysis indicated the presence of esters and carboxylic acid groups, whereas the hardness test showed that polyester with a ratio of COOH/OH 0.7 had a higher hardness. The hardness level for polyester with the ratio of 0.7 was also reinforced by the degree of crystallinity shown by XRD analysis. It could be expected that modification shellac might be one of an alternative way to produce a material coating which is more environmentally friendly

Optimasi Proses Ekstraksi Furfural Bagasse Dan Trash Serta Potensinya untuk Material Coating Lestari Hetalesi Saputri; Rika Wulandari; Ahmad Fauzi
Jurnal Teknologi Vol 8, No 2 (2021): Jurnal Teknologi
Publisher : Universitas Jayabaya

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.31479/jtek.v8i2.72

Furfural merupakan salah satu produk intermediate yang banyak dibutuhkan oleh industri kimia untuk pembuatan produk jadi, seperti resin, wax, desinfektan, minyak pelumas, karet sintetis dan sebagainya. Produk ini dapatdihasilkan dari bahan-bahan yang mengandung pentosan tinggi, termasuk dari bagasse dan trash. Penelitian ini bertujuan untuk mensintesis produk furfural dari bagasse dan trash (daduk dan siwilan). Selain itu, untuk mengetahui potensi furfural yang dihasilkan untuk aplikasi produk coating material, ditinjau dari ikatan kimia yang terbentuk.Produk coating material yang berupa resin polimer dapat dibentuk melalui proses polikondensasi, yaitu proses yang menggabungkan beberapa gugus fungsi seperti gugus hidroksil dengan karboksil, karbonil dengan amina atau gabungannya. Furfural dari bagasse dan trash dapat diperoleh melalui proses hidrolisis asam. Campuran bagassedan trash direaksikan di dalam labu leher tiga dan diaduk menggunakan magnetik stirer. Reaksi hidrolisis dilakukan dengan bantuan katalis asam asetat pada berbagai variasi konsentrasi. Selain itu juga dilakukan variasi suhu dan waktu hidrolisis. Kemudian, hidrolisat dianalisis melalui uji warna dan dititrasi untuk mengetahui yield furfural, sementara ampas sisa hidrolisis dianalisis dengan FTIR (Fourier Transform Infra Red). Uji FTIR dilakukan untuk mengetahui sisa furfural yang belum terambil selama proses hidrolisis. Dari hasil penelitian, didapatkan yield furfural optimal sebesar 12,88% pada suhu 90ºC dengan kadar asam asetat 14% dan perbandingan bagasse:daduk:siwilan sebesar 2:1:1.

Socialization on the utilization of household organic waste as liquid organic fertilizer in vegetable cultivation Rina Ekawati; Anna Kusumawati; Lestari Hetalesi Saputri; Pantjasiwi Veni Rahayu Ingesti; Luci Paonganan
Jurnal Pemberdayaan: Publikasi Hasil Pengabdian Kepada Masyarakat Vol. 5 No. 2 (2021)
Publisher : Universitas Ahmad Dahlan, Yogyakarta

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.12928/jpm.v5i2.3222

Waste or organic waste from households can be converted into liquid organic fertilizer (POC) because organic waste contains nutrients that can be used as fertilizer. Waste becomes a problem not only in urban areas but also in rural areas because the population is increasing, so that waste production is also more. Household waste that is generated every day can be used as fertilizer by composting, but its utilization is not optimal. The socialization activity aims to provide education and increase insight to the community into the use of household organic waste. The community is given knowledge about the importance of utilizing household organic waste, how to manage household organic waste through the composting process, utilizing household organic waste as liquid organic fertilizer in cultivating vegetable crops, the benefits and cost-efficiency of organic vegetables for family self-sufficiency and organic vegetable business opportunities. The socialization involved 35 people, and the form of activity evaluation uses a questionnaire containing general characteristics of the respondent and selected questions. The results of the evaluation show that the age characteristics of the respondents are 50 - 59 years old, and the level of formal education is from Junior High School to Senior High School. On average, respondents already know and understand how to use household waste by composting a composter bucket (100%) as liquid organic fertilizer

Produksi Umbi dan Kandungan Flavonoid Bawang Dayak dengan Pemupukan Organik Kompos Vinasse Rina Ekawati; Lestari Hetalesi Saputri
AGRO SINTESA JURNAL ILMU BUDIDAYA PERTANIAN Vol 2, No 1 (2019): Agro Sintesa Jurnal Ilmu Budidaya Pertanian
Publisher : Lembaga Penelitian Universitas Swadaya Gunung Jati

Bawang dayak (Eleutherine palmifolia L.) merupakan salah satu tanaman hortikultura yangdapat dijadikan sebagai tanaman berkhasiat obat kanker. Salah satu faktor yang memengaruhipertumbuhan tanaman adalah unsur hara yang dapat diberikan melalui pemupukan. Pupuk organikbermanfaat untuk meningkatkan kadar hara dan bahan organik tanah serta memperbaiki sifat fisik,kimia, dan biologi tanah. Vinasse yang telah mengalami proses pengomposan dapat digunakan sebagaisalah satu pupuk organik yang dapat meningkatkan pertumbuhan tanaman. Penelitian ini bertujuanuntuk mempelajari pengaruh pemberian pupuk organik kompos vinasse terhadap produksi umbi dankandungan flavonoid umbi bawang dayak. Percobaan ini dilakukan di Politeknik Lembaga PendidikanPerkebunan (LPP) Yogyakarta, dari bulan Juli hingga November 2018. Penelitian ini menggunakanrancangan acak kelompok faktor tunggal dengan 4 taraf perlakuan, yaitu tanpa pupuk cair vinasse +NPK (P1), pupuk organik cair pembanding + NPK (P2), pupuk cair vinasse melalui daun + NPK (P3),dan pupuk cair vinasse melalui tanah + NPK (P4). Setiap perlakuan diulang tiga kali sehingga terdapat12 satuan percobaan. Hasil pengomposan vinasse belum masuk dalam syarat teknis minimal pupukorganik cair dari Instalasi Pengelolaan Air Limbah Industri berdasarkan Peraturan Menteri PertanianNomor 70/Permentan/SR.140/10/2011. Pemberian vinasse baik melalui daun maupun tanah tidakmempengaruhi jumlah anakan, bobot basah dan kering biomassa, produksi umbi (jumlah dan bobotumbi per tanaman), dan produksi flavonoid bawang dayak.Kata kunci: bawang sabrang, bahan organik, biomassa, metabolit sekunder

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