Liu Hong,Jiang Ximeng,Hu Xiaodong,Cui Mingxian,Fan Yongzhi,Wu Gang
Issue:
Volume 1, Issue 1, March 2019
Pages:
1-7
Received:
8 April 2019
Accepted:
12 May 2019
Published:
27 May 2019
Downloads:
Views:
Abstract: Polyphenylene sulfide is a kind of engineering plastics with excellent comprehensive properties and wide application. A large number of solvents will be produced in the production of polyphenylene sulfide, and its recovery is very important to reduce the production cost of polyphenylene sulfide and improve the product quality. At present, most of the production enterprises of polyphenylene sulfide use vacuum distillation to recover solvents. In this paper, these main problems existing in solvent recovery process in vacuum distillation are summarized, the original process is reformed. Compared with the original process, the monthly average recovery of NMP and H2O are increased by 83.4 t and 372.6 t respectively, and the recovery rate of NMP and H2O are increased by 11.9% and 76.3% respectively. The processing capacity of solvent recovery system is increased by 58.3%, and the heat duty of distillation is saved by 30.4%. The salt deposit at the bottom of the distillation column is greatly reduced, and the problem of equipment failure caused by blockage is basically solved. As a result, the impurity content in the recovery system is greatly reduced, and the qualified rates of NMP solvents and polyphenylene sulfide products are increased by 19.4% and 12.2% respectively. Furthermore, the total emissions of harmful components such as chlorobenzene, hydrogen sulfide, ammonia and non-methane hydrocarbons in the exhaust air is reduced by 96.9%, and the monthly average waste water volume of sewage treatment system was reduced by 67.6%, and the contents of COD and ammonia nitrogen in waste water are obviously improved.Abstract: Polyphenylene sulfide is a kind of engineering plastics with excellent comprehensive properties and wide application. A large number of solvents will be produced in the production of polyphenylene sulfide, and its recovery is very important to reduce the production cost of polyphenylene sulfide and improve the product quality. At present, most of t...Show More
Pan Huimin,Shu Shiyu,Wang Jiaqi,Ning Chailin,Li Tiechun,Hui Ruihua
Issue:
Volume 1, Issue 1, March 2019
Pages:
8-12
Received:
10 April 2019
Accepted:
14 May 2019
Published:
27 May 2019
Downloads:
Views:
Abstract: Berberine hydrochloride was extracted from Cortex Phellodendri Chinense and Cortex Phellodendri amurensis, and the content of berberine hydrochloride was analyzed and compared. Extraction of berberine hydrochloride from Cortex Phellodendri Chinense and Cortex Phellodendri amurensis by ultrasonic method was carried out, and extraction conditions such as extraction reagent concentration, extraction time, extraction temperature and liquid ratio were optimized. The content of berberine hydrochloride in Cortex Phellodendri Chinense and Cortex Phellodendri amurensis was determined by HPLC, and the mobile phase was methanol-acetonitrile-phosphoric acid (0.01 mol/L) (10:28:62,V/V), the flow rate was 1 mL/min, and the detection wavelength was 350 nm. The sample input is 10μL. The linear range is 2.20 mm g/mL ~ 13.20 mm g/mL, the standard deviation (RSD) is less than 2.70 %, and the standard recovery rate is 93.21 ~ 99.38 %. The contents of berberine hydrochloride from Cortex Phellodendri Chinense and Cortex Phellodendri amurensis were 57.80mg/g and 48.20 mg/g respectively. The content of berberine hydrochloride in Cortex Phellodendri Chinense was higher than that in Cortex Phellodendri amurensis.Abstract: Berberine hydrochloride was extracted from Cortex Phellodendri Chinense and Cortex Phellodendri amurensis, and the content of berberine hydrochloride was analyzed and compared. Extraction of berberine hydrochloride from Cortex Phellodendri Chinense and Cortex Phellodendri amurensis by ultrasonic method was carried out, and extraction conditions su...Show More
Abstract: As a class of common plant hormones, cytokinins (CTKs) can greatly promote cell division and have wide application in agricultural production. Therefore, it is necessary to monitor the residue of CTKs in food or environment. Molecular Imprinting polymer (MIP) with kinetin-6-furfurylaminopurine (6-KT) as the template molecule was prepared using multiple polymerizations. The MIP was used as the fiber coating of solid-phase microextraction (SPME), and then molecular imprinting solid-phase microextraction (MISPME) assay was developed. A series of MISPME extraction conditions were optimized in detail. The extraction was performed at 60°C for 30 min with n-hexane as the extraction solvent and stirring speed of 400 rpm, with 15 µL ethanol as the desorption solvent and desorption for 10 min. For vegetable and environmental water samples, two kinds of CTKs were analyzed by high performance liquid chromatography with UV detector. The enrichment factors of kinetin-6-furfurylaminopurine (6-KT) and N6-benzyladenine (6-BA) were 154 and 163, with whose detection limits of 0.3 ng/mL and 0.5 ng/mL, respectively. The proposed method was sensitive and reproducible, and it was suitable to the pretreatment and selective enrichment of plant hormones.Abstract: As a class of common plant hormones, cytokinins (CTKs) can greatly promote cell division and have wide application in agricultural production. Therefore, it is necessary to monitor the residue of CTKs in food or environment. Molecular Imprinting polymer (MIP) with kinetin-6-furfurylaminopurine (6-KT) as the template molecule was prepared using mult...Show More
