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A method and device for separating maleic anhydride from a gas phase stream containing maleic anhydride

A gas-phase logistics and separation technology, applied in the field of maleic anhydride production, can solve the problems of many by-products, high energy consumption, and low yield of maleic anhydride, and achieve the effects of high absorption rate, low residual rate, and no pipeline blockage

Active Publication Date: 2016-04-13
CHANGZHOU RUIHUA CHEM ENG&TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

Since the maleic anhydride hydrolysis reaction is an exothermic reaction, the dehydration reaction is an endothermic reaction, so the energy consumption of the aqueous solution absorption method is very high; at the same time, the maleic acid isomerized into fumaric acid, there are many by-products, and the yield of maleic anhydride is low

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  • A method and device for separating maleic anhydride from a gas phase stream containing maleic anhydride

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Embodiment 1

[0044] Example 1, the absorption-light removal process with an annual output of 50,000 tons of maleic anhydride

[0045] The gas after the n-butane oxidation reaction, that is, the maleic anhydride-containing gas stream 101, its composition (%wt) is as follows: N2: 74.84, O2: 13.33, H2O: 5.65, CO: 0.73, CO2: 1.18, n-C4H10: 1.0, MAN: 3.10, acetic acid: 0.08, acrylic acid 0.04, temperature 170°C, pressure 190kPa, flow rate 212302kg / h, in absorption tower 10, absorbed by 30000kg / h DBP solvent (stream 113), DBP solvent contains 0.28% maleic anhydride (wt), and 6000kg / h of fresh DBP solvent (stream 114) absorption.

[0046] Wherein tower 10 has 24 theoretical boards in total, 6 theoretical boards in the upper section, and 8 theoretical boards in the lower section. The stripper 20 has 5 theoretical plates. The function of side draw cooler 31 is to cool the side draw flow to 70-80°C, in this example to 75°C. The heater 32 of the stripper acts to heat stream 109 to 170°C. The func...

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Abstract

The invention provides a method and a device for separating maleic anhydride from gas phase material flow containing maleic anhydride. According to the design, the maleic anhydride in the gas phase material flow is chilled and absorbed by using a great amount of solvent before a gas phase flow absorption stage, subsequently the residual gas phase is gradually cooled and absorbed by using the solvent, and the rich solvent which absorbs the maleic anhydride is heated so as to decompose cis-acid formed in the solvent, so that the situation that a device is stopped to wash as fumaric acid, cis-acid and maleic anhydride are condensed is avoided, the operation period of the device is prolonged, and the production efficiency is improved.

Description

technical field [0001] The invention belongs to the field of maleic anhydride production, and in particular relates to a method and a device for separating maleic anhydride from a gas phase stream containing maleic anhydride. Background technique [0002] Maleic anhydride (referred to as maleic anhydride, MA) is also known as maleic anhydride and dehydrated malic anhydride. It is an important organic chemical raw material and fine chemical product. It is the third largest acid anhydride in the world after phthalic anhydride and acetic anhydride. It is mainly used in the production of unsaturated polyester resin (UPR) and alkyd resin. It can also be used in Produce a series of important organic chemicals and fine chemicals such as 1,4-butanediol (BDO), γ-butyrolactone (GBL), tetrahydrofuran (THF), maleic acid, fumaric acid and succinic anhydride, etc. , medicine, coatings, inks, lubricating oil additives, paper chemicals, textile finishing agents, food additives and surfacta...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C07D307/60
CPCC07D307/60Y02P20/50
Inventor 徐志刚和成刚杨蓓玉张文明
Owner CHANGZHOU RUIHUA CHEM ENG&TECH