混合气脱水工序冷冻盐水阀门的应用

分析了氯乙烯合成工段混合气脱水工序-35℃冷冻盐水阀门的应用情况,介绍了四川省金路树脂有限公司所选用的截止阀工艺方案。     

Temperatures required for eutectic freezing of natural waters

The eutectic freezing process separates aqueous solutions of inorganic salts into solid salt and fresh water. It is useful for treating cooling tower and boiler blowdown and the brine effluent from inland desalting plants.By freezing the water out of these aqueous solutions until they are adequately concentrated to precipitate the salt simultaneously, one ends up with no brine product. The ice and salt crystals nucleate and grow independently and are easily separated since the ice floats and the salt sinks.Laboratory investigation of the eutectic temperatures of various proportions of the ions commonly found in natural waters (Na, K, Ca, Mg, Cl, SO₄, HCO₃) shows that the process will operate well at temperatures no lower than ?25°C.     

盐水精制工艺的发展及应用

介绍了凯膜、陶瓷膜及西恩过滤器等盐水精制新工艺的原理、特点及运行比较     

膜法除硝技术在氯碱盐水生产中的应用

介绍了膜法除硝技术在氯碱盐水生产中的应用情况,比较了2种处理装置的运行情况.     

The treatment and disposal of waste brine solutions

A serious limitation in the use of desalination plants producing concentrated solutions is the lack of adequate methods of waste brine disposal such that the brine does not re-enter and contaminate the raw water inlet system.Various options for the potential disposal of waste brines have been presented. Procedures which enable the separation, precipitation and chemical transformation of specific species have been discussed. In addition, the implementation of various waste brine disposal options has been illustrated by means of case studies for a range of industrial processes.     

淡盐水脱氯工艺

介绍脱氯工艺的控制、脱氯原理及操作条件。     

盐水工艺的改进

总结了盐水工艺的改进措施,通过改进,一次盐水的质量得到了较大的提高。     

改进盐水工艺提高盐水质量

利用原有的工艺管线对盐水生产工艺进行改进，以提高精盐水的质量，从而提高了电解槽的运行效率，降低了烧碱生产的直流电耗。     

电解盐水预热工艺改造

通过对电解精盐水预热工艺几次改造的介绍,阐明了氯碱企业进行工艺改造的必要性。提出:企业要发展,就必须通过扩产或增上项目以求达到规模效益;同时,在正常的生产管理和生产实践当中进行技术革新和技术改造,也能达到降低成本、提高经济效益的目的。     

掺卤水制取一次盐水工艺分析

分析了影响提高掺卤量的因素。结合化工园区自身优势,将卤水及膜法脱硝产生的富硝水合理利用。卤水净化工艺采用石灰烟道气法,与常规两碱法相比,可降低盐水精制费用。     

盐水精制过程分析

通过对离子膜进槽盐水中不纯物的来源及危害的分析，提出优化盐水精制的方法，以期提高盐水质量。     

盐水精制新工艺

介绍了采用新工艺精制离子膜电解槽盐水的工艺概况、特点及参数。指出了存在的问题及注意事项。     

Designing a biocatalytic process involving deep eutectic solvents

During the last decade, deep eutectic solvents (DESs) have emerged as a promising alternative to traditional organic solvents, from both environmental and technological perspectives. The number of structural combinations encompassed by DESs is tremendous; thus, it is possible to design an optimal DES for each specific enzymatic reaction system. In (bio)catalytic processes, a DES can serve as solvent/co‐solvent, as an extractive reagent for an enzymatic product, and as a pretreatment solvent of enzymatic biomass. To date, hydrolases are the most studied enzymes in DESs, which is not surprising given that lipases are the most important industrial enzymes. At the same time, there are a limited number of papers dealing with synthetic reactions in DESs involving other hydrolytic enzymes (epoxide hydrolases, phospholipase, proteases and haloalkane dehalogenases), lyases, and dehydrogenases (as a part of the whole Saccharomyces cerevisae and Escherichia coli cell biocatalysis). When designing efficient biocatalytic processes involving DESs, independent of the reaction type and enzyme used, the following steps should be included: (i) preparation and characterisation of the DES, (ii) screening of the DES for optimal enzyme performance, (iii) selection and optimisation of the biocatalytic protocol, and (iv) recovery of the product/DES and DES recycling with possible scale‐up. In this paper, we will present some practical aspects that we experienced while working with these solvents, together with some major observations that are available in the literature. © 2020 Society of Chemical Industry     

一次盐水系统工艺优化

分析了河南永银化工实业有限公司一次盐水系统存在的问题,提出并实施了具体工艺的优化方案,取得了可观的经济效益.     

冷冻共晶法结晶谷氨酸钠介稳区测定

冷冻共晶技术的最大特点是冰晶和固体盐同时结晶析出,介稳区的测定是冷冻共晶操作的关键研究之一。文中采用静态法测定了谷氨酸钠在0℃以下的溶解度。实验结果表明:随着温度的降低,谷氨酸钠的溶解度降低。利用FBRM,PVM在线监测系统测定了谷氨酸钠在不同的搅拌速率、降温速率、晶种加入量条件下的超溶解度。根据溶解度和超溶解度曲线,确定了谷氨酸钠的介稳区宽度。研究表明:在一定条件下,搅拌速率越小、降温速率越快、加入晶种量越多,谷氨酸钠介稳区越宽。测定的介稳区数据为后续谷氨酸钠冷冻共结晶实验打下基础。     

一次盐水工艺技术改造总结

介绍了金川公司化工厂40万t/a离子膜法烧碱项目一期工程自投产运行以来一次盐水工序存在的问题,结合近几年来摸索出的经验和对国内一些氯碱企业的考察结果,提出了对应的技术改造,并成功应用在二期工程中。     

盐水生产工艺技术探讨

介绍和分析了目前国内氯碱行业应用的盐水精制和分离工艺技术,对精制和分离设备的原理、特点、优缺点进行了分析和对比。     

改进盐水生产工艺降低生产成本

介绍了通过改进盐水生产工艺，提高精细盐和液体氯化钡的使用量，降低了生产成本，提升了生产运行的经济效益。     

MDI生产装置盐水处理流程模型的建立

论述了Aspen plus工艺流程模拟软件在盐水中有机物回收工艺中的应用,详细介绍了盐水处理单元模型建立的方法,该模型成功应用于二苯基甲烷二异氰酸酯（MDI）生产流程开发过程中,取得了良好的应用效果。