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A kind of reactive distillation prepares mtbe and its wastewater treatment method

A waste water treatment and reactive distillation technology, applied in water/sewage multi-stage treatment, biological water/sewage treatment, extraction water/sewage treatment, etc., can solve the problem that the use time is only 6-8 months, and achieve the source of raw materials Economy, increase efficiency, reduce COD effect

Active Publication Date: 2021-03-09
WANHUA CHEM GRP CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0010] The purpose of the present invention is to provide a method for preparing MTBE by reactive distillation and its wastewater treatment method, which solves the problems caused by frequent replacement of catalysts due to catalyst life in traditional reactive distillation towers, especially when resin catalysts are used, and the use time is only 6-8 months. Solve the problem of device parking and improve the conversion rate of TBA

Method used

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  • A kind of reactive distillation prepares mtbe and its wastewater treatment method

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Effect test

Embodiment 1

[0035] Such as figure 1 As shown, a rectification column with a theoretical plate number of 68 is used, with two side reactors connected by a heat exchanger and a compressor. Tert-butanol and methanol are respectively fed at the 27th and 57th theoretical plates of the rectification tower. Tert-butanol comes from the by-product of propylene oxide produced by the co-oxidation method, and there are about 1wt.% impurities in it, mainly isobutyric acid , Isobutanol, Isopropanol, etc. Reactor-2 draws a stream of material from the 35th theoretical plate of the rectification tower as a feed, and the discharge position is at the 20th theoretical plate; A stream of material is drawn from the plate as the feed, and the discharge position is at the 40th theoretical plate.

[0036] Both reactors use Rohm and Haas A-35 resin catalyst, the reactor pressure is 2MPa, and the temperature is 100°C. The feed mass ratio of tert-butanol to methanol is 1:1, and the residence time of materials in ...

Embodiment 2

[0041] On the basis of Example 1, the feed mass ratio of tert-butanol to methanol was changed to 3:4, and the other reaction and distillation parameters remained unchanged, D / F=0.86.

[0042] After the device was stabilized, sampling and analysis were carried out on the top of the rectification tower and the bottom of the tower. The water content in the bottom of the tower was 99.13wt%, tert-butanol was 0.51wt%, and methanol was 0.28wt%. The content of isobutene in the top was 8.46wt%, The content of MTBE is 65.17wt%, the content of methanol is 25.83wt%, the content of TBA is 0.31wt%, and the content of water is 0.10wt%. The conversion of TBA was 99.41%, the selectivity of isobutene was 16.94%, and the selectivity of MTBE was 82.79%.

[0043] The COD value of the produced wastewater is 35000mg / L, and the B / C value is 0.15. The extraction device is a multi-stage oil-water separator, the theoretical stage of the extraction device is 1, the mass ratio of the extraction agent to ...

Embodiment 3

[0046] On the basis of Example 1, the catalyst in Reactor-1 was replaced with H-ZSM-5, and the temperature of Reactor-1 was adjusted to 150° C. and the pressure to 3 MPa. All the other reaction and distillation parameters are unchanged, D / F=0.875.

[0047] After the device stabilized, sampling and analysis were carried out to the top of the rectification tower and the bottom of the tower. The water content in the bottom of the tower was 99.32wt%, tert-butanol was 0.19wt%, and methanol was 0.23wt%. The MTBE content was 57.17wt%, the methanol content was 35.93wt%, the TBA content was 0.09wt%, and the water content was 0.11wt%. The conversion rate of TBA is 99.80%, the selectivity of isobutene is 15.07%, and the selectivity of MTBE is 84.68%.

[0048] The COD value of the generated wastewater is 38000mg / L, and the B / C value is 0.13. The extraction device is a multi-stage mixing clarifier, the theoretical number of stages of the extraction device is 2, the mass ratio of the extr...

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Abstract

The invention discloses a method for preparing MTBE by reactive distillation and its wastewater treatment method. Using tert-butanol and methanol as etherification raw materials, wherein tert-butanol comes from co-oxidation to produce propylene oxide by-product; the traditional reactive distillation column including the reaction section and rectification section is split into two parts, and the reaction section is divided into two parts. The form of the side reactor is mounted outside the rectification tower, and multiple side reactors can be used to ensure the conversion rate of raw materials; the generated etherification wastewater is extracted and rectified to realize the removal of impurities and the circulation of the extractant. The problem of device shutdown caused by frequent catalyst replacement is solved and the conversion rate of TBA is improved. By means of reactive distillation and extraction, the content of organic matter in wastewater is reduced, so that wastewater can meet the water quality requirements of biochemical treatment.

Description

technical field [0001] The invention relates to the technical field of catalytic reaction rectification and the field of wastewater treatment in the chemical industry, in particular to a method for preparing MTBE by reactive distillation and treating wastewater thereof. [0002] technical background [0003] MTBE (methyl tert-butyl ether) is a high-octane gasoline component. It is an excellent high-octane gasoline additive and antiknock agent, and can also be used to decompose and produce high-purity isobutene. [0004] Most literature reports use isobutene and methanol as raw materials to synthesize MTBE with the aid of acidic catalysts. Among them, resin catalysts are the most widely used catalysts in industry, and different synthetic routes have been formed according to different sources of isobutene. As reported in patent CN102701919A, the process of reacting mixed C4 with low isobutene content and methanol to generate MTBE; reported in patent CN104876785A, using the rema...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C07C43/04C07C41/09C07C41/38C02F9/14
CPCC02F1/26C02F3/00C02F9/00C07C41/09C07C41/38C07C43/046Y02P20/10
Inventor 董岩峰文鸣虞根海高学顺叶建初张振兴王磊
Owner WANHUA CHEM GRP CO LTD
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