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Method for preparing polymer-grade isobutene by cracking methyl tertbutyl ether

A technology of methyl tert-butyl ether and isobutylene, which is applied in the field of methyl tert-butyl ether cracking to produce polymer-grade isobutylene, can solve the problems of difficult control of operating conditions, increased investment and operating costs of water washing towers, etc., and achieves convenient and flexible operation, The effect of high utilization rate and high purity

Active Publication Date: 2014-05-07
CHINA PETROLEUM & CHEM CORP +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the water washing tower added by this method increases the investment and operating costs, and the internal parts with multiple rows of holes must be used, and the control of operating conditions is more difficult.

Method used

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  • Method for preparing polymer-grade isobutene by cracking methyl tertbutyl ether
  • Method for preparing polymer-grade isobutene by cracking methyl tertbutyl ether

Examples

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Effect test

preparation example Construction

[0025] figure 1 It is a typical schematic diagram of the preparation of high-purity isobutene. After MTBE is first refined through MTBE refining tower 1, it enters cracking reactor 2 to carry out cracking reaction under suitable operating conditions. The cracked product enters water washing tower 3, and the bottoms of water washing tower enter methanol recovery tower 4 and methanol refining tower 5 in turn. Methanol is recovered, and the crude isobutene product from the overhead of the water washing tower enters the isobutene de-weighting tower 6 and the isobutene de-lightening tower 7 in sequence, and finally the target product is obtained.

[0026] figure 2 It is a schematic diagram of the process for preparing high-purity isobutene of the present invention. After MTBE is first refined through MTBE refining tower 1, it enters cracking reactor 2 to carry out cracking reaction under suitable operating conditions. The cracked product enters water washing tower 3, and the bo...

Embodiment 1

[0043] An adsorption tower with a size of Φ100mm (inside)×1100mm is used, and the 13X molecular sieve, amorphous silica-alumina and 5A molecular sieve adsorbents used in comparative example 1, comparative example 3 and comparative example 5 with a size of 1.5mm are filled sequentially from bottom to top. 1 / 3 by volume. Raise the temperature of the adsorption tower to 80°C, and the volumetric space velocity is 500h -1 The crude product of isobutene, which has been kept at a constant temperature of 80°C, is metered from top to bottom at 0.1 MPa. Sampling and analysis every 4h. The results are shown in Table 4.

Embodiment 2

[0045] Use an adsorption tower with a size of Φ100mm (inner)×1100mm, and fill it with 1.5mm-sized 13X molecular sieves such as those used in Comparative Example 1, Comparative Example 3 and Comparative Example 5 from bottom to top at a volume ratio of 10:20:70. Shaped silica alumina and 5A molecular sieve. Raise the temperature of the adsorption tower to 80°C, and the volumetric space velocity is 500h -1 The crude product of isobutene, which has been kept at a constant temperature of 80°C, is metered from top to bottom at 0.1 MPa. Sampling and analysis every 4h. The results are shown in Table 4.

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Abstract

The invention discloses a method for preparing polymer-grade isobutene by cracking methyl tertbutyl ether. The method comprises the following steps: cracking methyl tertbutyl ether so as to obtain a cracking product, then processing the cracking product in a bath tower so as to obtain an isobutene crude product, and finally carrying out absorption separation on the isobutene crude product in an absorption tower so as to obtain the polymer-grade isobutene product; wherein the absorbent in the absorption tower is a mixture of an LTA molecular sieve, amorphous silicon-aluminum, and an FAU molecular sieve. The method provided by the invention can effectively remove the impurities such as dimethyl ether, methanol, water, polyisobutene, and the like from the isobutene crude product, can also reduce the investment and energy consumption, and is capable of enabling equipment to obtain a polymer-grade isobutene product on the basis of easier operation.

Description

technical field [0001] The invention relates to a method for cracking methyl tert-butyl ether (MTBE) to produce polymer grade isobutylene. Background technique [0002] Isobutene is an important organic chemical raw material. When isobutene is used as the main raw material to produce downstream products, the requirements for the purity of isobutene are different due to different products, especially for the production of polymer grade isobutene, the requirements are higher. [0003] A large part of the production of polymer grade isobutylene is to meet the needs of synthetic butyl rubber. In recent years, with the increase in the consumption of butyl rubber inner tubes, radial tires, medical bottle stoppers, and waterproof materials, the consumption of butyl rubber has been increasing, especially in China. According to the "2010-2015 China Synthetic Rubber Industry Investment Analysis and Prospect Forecast Report" issued by China Investment Consulting, the apparent consump...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C07C11/09C07C1/20C07C7/12C07C7/13
Inventor 张淑梅陈明翟庆铜乔凯郭长新王春梅
Owner CHINA PETROLEUM & CHEM CORP
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