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Azeotropic distillation with entrainer regeneration

A technology of azeotropic distillation and azeotropic agent, which is applied in the field of azeotropic distillation of azeotropic agent regeneration, can solve the problems of increasing cost, increasing the diameter of energy consumption tower and the like

Inactive Publication Date: 2010-10-06
INVISTA TECHNOLOG IES S A R L
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

During azeotropic distillation, these by-products tend to settle in the top region of the distillation column where more water is dissolved, which in turn increases energy consumption and required column diameter
In addition, as the entrainer degrades and forms by-products, more entrainer must be added to the azeotropic distillation column to achieve separation, which increases the cost of the operation

Method used

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  • Azeotropic distillation with entrainer regeneration
  • Azeotropic distillation with entrainer regeneration
  • Azeotropic distillation with entrainer regeneration

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 2

[0105] 多次运行实验室规模的分批高压釜,证明有机共沸剂副产物转化回到有机共沸剂。高压釜内的条件设计成与共沸蒸馏塔的下部部分相似。为了证明转化,在至分批高压釜中的进料中,将醋酸正丙酯(nPA)用作共沸剂,丙醇(PrOH)用作共沸剂副产物。如表2详述,水和醋酸也进料至分批高压釜。通过在每次运行之后从高压釜的液体取样,检测丙醇的浓度。记录系统中的进料组合物、丙醇减少的百分比、停留时间和分批高压釜的温度。结果在下面的表2中。

[0106] Table 2

[0107]

Embodiment 3

[0109] 使用Aspen模拟和动力学模型证明酯化反应器R1的有效性。 酯化器进料浓度通过Aspen模拟产生,并应用至醋酸正丙酯水解 / 酯化的动力学模型。 根据该模型,测定正丙醇转化的速率。 Such as Figure 4 所示,用于产生酯化反应器R1进料组合物的Aspen模拟的布置范围很宽,具有以下差异:

[0110] ·按两个分开的部分(顶部和底部),建立醋酸甲酯回收塔D2的模型。

[0111] ·仅一部分来自再循环倾析器(管线9)的有机物进入酯化器。剩余部分在以回流的形式回到塔之前与管线5混合。

[0112] ·在ASPEN模型中有PX净化塔(purge column)。

[0113] ·有在各种位置模拟共沸剂水解的水解模块。通过在酯化器模块中规定的分级转化的值,控制丙醇在回流(管线5)中的静置浓度。

[0114] Aspen模拟由以下主要单元操作组成:

[0115] ·脱水塔D1和再沸器E1:规范:顶部P=3.8巴,底部P=4巴,通过″设计规范″控制底部产物

[0116] ·脱水塔冷凝器E2:规范:T=115-116C

[0117] ·醋酸甲酯回收塔:P=3.65-4巴

[0118] ·酯化器R1:规范:P=7巴,T=160C

[0119] 使用下式计算酯化速率:

[0120] d [ PrOH ] dt = 0.23 ( [ nPA ] [ H 2 O ] 5 - [ PrOH ] ...

Embodiment 4

[0125] 使用Aspen模拟和动力学模型证明酯化反应器R1的有效性。 exist Image 6 的布置中运行Aspen模拟,并产生用于如实施例3的动力学模型的酯化器进料浓度。模拟布置差异、单元操作描述和速率计算与实施例3相同。结果在下面的表4中。

[0126] Table 4

[0127]

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Abstract

The present invention relates to a process for azeotropic distillation (Dl) of a feedstock (1), wherein the feedstock (1) comprises an aliphatic carboxylic acid and water, comprising conducting the azeotropic distillation (Dl) in the presence of an organic entrainer to produce a liquid phase component (2) comprising said aliphatic carboxylic acid having a reduced water content relative to the water content in the feedstock (1) and a vapor phase component (3) comprising the organic entrainer, an organic entrainer by-product and water, and either (i) returning a stream comprising the organic entrainer by-product to a point in the azeotropic distillation below where the feedstock is fed (9), wherein the organic entrainer by-product is converted to the organic entrainer or (ii) converting the organic entrainer by-product to the organic entrainer and then returning the organic entrainer to the azeotropic distillation.

Description

[0001] Cross References to Related Applications [0002] This application claims priority to Provisional Application No. 60 / 950,426, filed July 18,2007. field of invention [0003] The present invention relates to the separation of water from a liquid medium comprising water and at least one organic component, and more particularly, the separation of water from a feed stream comprising water and an aliphatic carboxylic acid. Background of the invention [0004] In, for example, the production of terephthalic acid by the liquid-phase oxidation of p-xylene in an aliphatic carboxylic acid solvent such as acetic acid, water and solvent are typically removed from the oxidation reactor as an overhead vapor stream as a means of controlling the reaction temperature. way. The vapor stream is condensed to recover condensates, some of which may be recycled as reflux to the oxidation reactor, while other condensates are passed to a separation process which in turn allows the recovery ...

Claims

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Application Information

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IPC IPC(8): B01D3/36B01D3/38B01D3/40
CPCC07C51/46B01D3/36C07C53/08
Inventor G·R·埃尔德A·布罗亚德本特D·吉亚西A·P·J·林巴赫
Owner INVISTA TECHNOLOG IES S A R L