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High-purity MTBE production process

A production process, high-purity technology, applied in the chemical industry, ether separation/purification, sustainable manufacturing/processing, etc., can solve the problems of long production process, poor economy, shortening, etc., to simplify the production process, expand Field of application, effect of reducing the number of trays

Active Publication Date: 2019-02-26
CHINA PETROLEUM & CHEM CORP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The production process of this process is long, and there are many equipments. It needs two etherifications to ensure the production of high-purity MTBE, which ultimately leads to poor economical efficiency of this process.
It is reported that tert-butanol and methanol are used as raw materials to produce high-purity MTBE. The process flow is relatively shortened, but the preparation cost of anhydrous tert-butanol is relatively high, resulting in low economic efficiency of the process.

Method used

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  • High-purity MTBE production process

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0058] The composition of C4 raw materials is shown in Table 1, and methanol is the first grade product. In the production process of high-purity MTBE, reactor 2 uses cation exchange resin as the catalyst, the molar ratio of alcohol / olefin is 1.1, the volume space velocity of the catalyst is 1.5, the reaction pressure is 0.6atm, and the reaction temperature is 50°C; catalytic rectification Tower 4 uses cation exchange resin as a catalyst, the alcohol / olefin molar ratio is 1.2, the volume space velocity of the catalyst is 1.0, the tower top pressure is 0.6-0.7atm, and the reaction temperature is 65°C; the reflux ratio of rectification tower 5 is 3.5 , the number of theoretical plates is 20, the adsorbent of the VI adsorption reactor is modified 5A molecular sieve, the space velocity is 10, the temperature is 40°C, and the pressure is 0.8MPa. The composition of MTBE products at different positions is shown in Table 2.

[0059] Table 1 C4 raw material composition wt%

[0060] ...

Embodiment 2

[0068] The composition of C4 raw materials is shown in Table 1, and methanol is a superior product. In the production process of high-purity MTBE, reactor 2 uses cation exchange resin as the catalyst, the molar ratio of alcohol / olefin is 1.05, the volume space velocity of the catalyst is 2.0, the reaction pressure is 0.6atm, and the reaction temperature is 52°C; catalytic rectification Tower 4 uses cation exchange resin as a catalyst, the alcohol / olefin molar ratio is 1.25, the volume space velocity of the catalyst is 1.2, the tower top pressure is 0.6-0.7atm, and the reaction temperature is 55°C; the reflux ratio of rectification tower 5 is 3.5 , the number of theoretical plates is 12; the adsorbent of the VI adsorption reactor is modified 5A molecular sieve, the space velocity is 13, the temperature is 40°C, and the pressure is 0.8MPa. The composition of MTBE products at different positions is shown in Table 3.

[0069] Table 3 Composition wt% of MTBE products in different p...

Embodiment 3

[0076] The composition of C4 raw materials is shown in Table 1, and methanol is the first grade product. In the production process of high-purity MTBE, the reactor 2 uses molecular sieve as the catalyst, the molar ratio of alcohol / olefin is 1.05, the volume space velocity of the catalyst is 1.0, the reaction pressure is 0.6atm, and the reaction temperature is 60°C; the catalytic rectification tower 4 Molecular sieve is used as the catalyst, the molar ratio of alcohol / olefin is 1.15, the volume space velocity of the catalyst is 0.5, the tower top pressure is 0.6-0.7atm, the reaction temperature is 65°C; the reflux ratio of rectification tower 5 is 4.5, and the number of theoretical plates The adsorbent of the VI adsorption reactor is modified 5A molecular sieve, the space velocity is 8, the temperature is 40°C, and the pressure is 0.7MPa. The composition of MTBE products at different positions is shown in Table 4.

[0077] Table 4 The composition wt% of MTBE products in differe...

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Abstract

The invention relates to a high-purity MTBE production process, which comprises: a, completely mixing C4 and partial methanol to form a homogeneous phase; b, carrying out an etherification reaction onthe obtained mixture; c, feeding the mixture after the reaction and the remaining methanol into a second static mixer; d, feeding the mixture from the second static mixer into a catalytic rectification tower, continuously carrying out a catalytic rectification reaction on the isobutene and the methanol in the mixture under the action of a catalyst to generate MTBE, and separating C4, methanol andMTBE through rectification; e, feeding the crude product obtained from the bottom of the catalytic rectification tower, and further purifying the MTBE product through rectification; and carrying outadsorbing refining on the product from the top of the rectification tower, such that it is ensured that the product can meet the quality requirement. According to the present invention, with the high-purity MTBE production process, the production of the high-purity MTBE is ensured, and the production process is simplified; and by using the adsorbing refining process, the number of the trays of therectification tower is reduced so as to reduce the energy consumption of the separation device.

Description

technical field [0001] The invention relates to a production process of high-purity MTBE. Background technique [0002] Methyl tert-butyl ether MTBE is a colorless, transparent, high-octane liquid with an ethereal odor. It has a high octane number, suitable oxygen content, and is an ideal blending component for the production of unleaded gasoline. As a gasoline additive, it can increase the octane number of gasoline, and has stable chemical properties, high combustion efficiency, and can inhibit the formation of ozone. The gasoline added with MTBE can also improve the cold start characteristics and acceleration performance of the car, and reduce the CO content in the exhaust gas. In addition, MTBE is also an important chemical raw material. It is used to produce high-purity isobutylene through its cracking, and then to produce isobutylene rubber and other products. It is widely used in fine chemical industry, but the purity requirement is high. [0003] At present, the pur...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C07C41/06C07C41/36C07C41/34C07C43/04
CPCC07C41/06C07C41/34C07C41/36C07C43/046Y02P20/10
Inventor 郭岩锋王文彬王鹏允建华张剑
Owner CHINA PETROLEUM & CHEM CORP
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