不锈钢波纹填料塔浓缩淡醋酸

一、概况彭浦化工厂生产双乙烯酮,用90％以上的醋酸做原料,以0.3～0.4％醋酸量的磷酸三乙酯做触媒(25％水溶液),在750℃温度下真空裂解为乙烯酮与水。为防止此反应的逆过程,加入以醋酸重量的0.05～0.1％的氨作为“阻逆剂”,掺入自来水,在这生产过程中得到30～40％(重量)的付产品淡醋酸。此酸经过浓缩波纹片填料塔,浓缩成80～90％浓醋酸,再做为生产双乙烯酮的原料。淡醋酸浓缩用“共沸脱水法”,醋酸的沸点118℃,水的沸点100℃。为了易使醋酸与水分离,有意地加入醋酸丁酯(沸点126℃)与醋酸中水形成共沸混合物(共沸温度90.2℃),以塔顶蒸出,浓醋酸停留在塔     

醋酸裂解炉在双乙烯酮生产技术中的发展与变革

醋酸裂解炉是双乙烯酮生产中最为关键的设备之一,裂解炉的技术发展与进步对双乙烯酮的能耗物耗作用重大,在伴随双乙烯酮发展的过程中裂解炉先后经历了电炉、油炉、气炉等发展与变革,也经历国外引进、国内提高、自主创新等进步阶断,目前燃气炉已成为当前醋酸裂解制双乙烯酮的主流方向。     

醋酸法双乙烯酮的环保生产

介绍了在醋酸高温裂解法生产双乙烯酮过程中采取的节能环保措施。     

大型立式冰醋酸储罐罐底突然鼓起变形原因分析

青岛双桃精细化工（集团）有限公司平度分公司地处青岛市平度西北角,毗邻渤海莱州湾畔。公司某车间使用醋酸裂解生产化工中间体双乙烯酮,年产双乙烯酮2万t,     

近年国外双乙烯酮生产工艺改进

一、前言双乙烯酮是一个化学性质活泼的有机中间体,在染料、医药、农药、饲料添加剂的生产上具有较重要的用途。目前,双乙烯酮的生产方法主要有两种:丙酮法和醋酸法。丙酮法得到的乙烯酮气体纯度低,亦不及醋酸法经济;醋酸法可利用醋酸纤维工业的过量醋酸,所以用醋酸法生产双乙烯酮较为普遍。     

醋酸系列热点产品现状及市场分析

醋酸是用途很广泛的基本有机原料，主要用于生产醋酸乙烯、醋酐、对苯二甲酸、聚乙烯醇、醋酸乙酯／丁酯等酯类、醋酸盐类、氯乙酸、醋酸纤维素、双乙烯酮等。也用于医药、农药、染料、涂料、合成纤维、塑料和粘合剂等行业。醋酸是碳一化学的重要产品，目前全世界70％以上的醋酸是用甲醇羰基合成法生产的。     

双乙烯酮的GC分析方法研究

研究了气相色谱对乙酸裂解法生产双乙烯酮的主产物、副产物的分析方法,在色谱柱SE-30,检测器为TCD,柱温120～200℃,升温速度为5℃/min的条件下,由内标法定量,所得各组份的相关系数R2分别为:双乙烯酮为0.9918,醋酐为0.9997,醋酸为0.9907,丙酮为0.9823,该方法简单、快速、重复性好,适应于双乙烯酮的定量分析。     

双乙烯酮市场前景广阔

双乙烯酮是一种精细有机化工原料,用途较广,市场行情很好。我国目前仅有22家生产厂,总生产能力约2万多t,年产量在1.25万t左右。最大的生产厂家是南通醋酸化工厂,年产量约有2500t。它有20多种衍生物,不少医药、农药厂家为自身配套双乙烯酮装置,生产双乙烯酮衍生产品。近两年来,该系列产品无论品种和数量均有较大     

废醋酸回收简介

一、简述青岛染料双乙烯酮在生产过程产生两种废醋酸,一种是浓废酸(80%),日排放0.57米~3;另一种是稀废酸(30～40%),日排放4米~3,这两种废醋酸都含有少量的有机杂质和无机盐。遵照毛主席“综合利用很重要,要注意”的教     

从乙烯酮二聚产品中分离双乙烯酮的间断或连续过程

双乙烯酮是由丙酮热裂解得到的乙烯酮二聚生成的。本发明介绍从含沸点接近的混合物中(含醋酐和醋酸)有效分离出高纯度的双乙烯酮。     

稀乙酸对聚乙烯醇水溶液静电纺丝性能的影响

采用质量分数3%乙酸水溶液作为高醇解度聚乙烯醇(PVA)的溶剂,研究了PVA稀乙酸溶液的性质及其静电纺丝工艺。结果表明:加入质量分数3%乙酸,PVA溶液粘度下降,表面张力及电导率提高;纺丝液浓度对PVA稀乙酸溶液的静电纺丝性能影响最大;当PVA稀乙酸溶液质量分数为8%～13%,固化距离15mm,纺丝电压14～18kV时,可制得形态良好的PVA超细纤维无纺毡。     

Energy saving in acetic acid process using an azeotropic distillation column with a side stripper

Dilute acetic acid is obtained primarily from fermentation and synthesis processes and cannot be produced by simple distillation due to relatively low volatility of acetic acid compared to water. Instead, an azeotropic distillation is applied to increase the concentration of dilute acetic acid. When acetic acid is extracted from a dilute aqueous solution using a solvent mixture of ester and alcohol, its recovery requires an energy-intensive azeotropic distillation. In the water stripping process that follows azeotropic distillation, two distillation columns handle the acetic acid and water mixture in similar composition. Therefore, the two columns can be combined as a side stripper connected to the azeotropic distillation column. The energy-saving effect is examined with the HYSYS (Aspentech Corporation) evaluation of the process. Compared to the conventional process, the modified process suggests 39% reduction in heating duty and 24% coolant savings. The economic analysis shows 32% decrease in investment and 36% utility savings. Based on heat utilization analysis, the thermodynamic efficiency is enhanced by 11%.     

醋酸稀溶液的络合萃取

络合萃取法对于极性有机物稀溶液的分离具有高效性和高选择性。本文以醋酸稀溶液为分离对象,通过系统的相平衡实验筛选出30 wt％三辛胺(或7301)+20 wt％正辛醇+50 wt％煤油混合溶剂。同时,探讨了叔胺类萃取剂对醋酸萃取的过程机理,研究了混合溶剂萃取稀醋酸工艺的可行性。     

双乙烯酮的合成与应用

介绍了双乙烯酮的合成方法:乙酸高温裂解法、乙炔氧化法、丙酮热解法和乙酸酐热解法。阐述了双乙烯酮在医药、农药、染料、饲料和食品添加剂方面的应用。     

催化精馏酯化法回收稀醋酸

采用催化精馏技术处理稀醋酸溶液,以乙醇为反应物,使醋酸转化为醋酸乙酯。催化剂选用自制的填料型SO42-/Al2O3-Al固体酸催化剂,实验考察了回流比、醇酸比、乙醇进料流量、稀醋酸浓度等因素对催化精馏过程的影响。     

Relation between mass transfer and operation parameters in the electrodialysis recovery of acetic acid

The recovery of acetic acid from dilute wastewater by means of bipolar membrane electrodialysis is studied in more detail. The current efficiency of the electrodialysis recovery of acetic acid from dilute wastewater is related to the current density and other operation parameters. There exists a highest value of current efficiency at optimal current density. The highest concentration of recovered acid is also related to current efficiency. The experimental data are analyzed on a theoretical basis.     

The use of dilute acetic acid for butyl acetate production in a reactive distillation: Simulation and control studies

The recovery of dilute acetic acid, which is widely found as a by-product in many chemical and petrochemical industries, becomes an important issue due to economic and environmental awareness. In general, separation of acetic acid in aqueous solution by conventional distillation columns is difficult, requiring a column with many stages and high energy consumption. As a result, the primary concern of the present study is the application of reactive distillation as a potential alternative method to recover dilute acetic acid. The direct use of dilute acetic acid as reactant for esterification with butanol to produce butyl acetate in the reactive distillation is investigated. Simulation studies are performed in order to investigate effect of the concentration of dilute acetic acid and key process parameters on the performance of the reactive distillation in terms of acetic acid conversion and butyl acetate production. In addition, three alternative control strategies are studied for the closed loop control of the reactive distillation. The control objective is to maintain the butyl acetate in a bottom product stream at the desired purity of 99.5 wt%.     

Removal of acetic acid from water by catalytic distillation. Part 1: Experimental studies

Catalytic distillation experiments were carried out in a 100 mm diameter column for the removal of dilute acetic acid from water. The column was installed with a novel internal composed of alternating a dualflow tray and a catalyst basket. Amberlyst 15 was used as a catalyst to accelerate the esterification of acetic acid with methanol. The effects of various operating parameters on the acid removal were investigated. For the feed which contains 2.5 to 9.9 wt% of acetic acid in water, more than 50 wt% of acetic acid can be recovered as methyl acetate in the 1.5 meter high test column.