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A kind of method for the cracking of methyl tert-butyl ether to prepare polymer grade isobutylene

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, High utilization rate and high removal rate of impurities

Active Publication Date: 2016-02-03
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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  • A kind of method for the cracking of methyl tert-butyl ether to prepare polymer grade isobutylene
  • A kind of method for the cracking of methyl tert-butyl ether to prepare polymer grade isobutylene

Examples

Experimental program
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Effect test

preparation example Construction

[0025] figure 1 It is a schematic diagram of a typical process for preparing high-purity isobutylene. MTBE is first refined by MTBE refining tower 1, and then enters cracking reactor 2 for cracking reaction under appropriate 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 The methanol is recovered, and the crude isobutylene product from the top of the water washing tower enters the isobutylene heavy-removing tower 6 and the isobutylene light-removing tower 7, and finally the target product is obtained.

[0026] figure 2 It is a schematic diagram of the process of preparing high-purity isobutylene of the present invention. MTBE is first refined by MTBE refining tower 1, and then enters cracking reactor 2 for cracking reaction under appropriate operating conditions. The cracked product enters water washing tower 3, and the bottoms of water washing t...

Embodiment 1

[0042] Adopt an adsorption tower with a size of Φ100mm (inner) × 1100mm, and sequentially fill with the 13X molecular sieve, amorphous silicon aluminum and 5A molecular sieve adsorbent used in Comparative Example 1, Comparative Example 3 and Comparative Example 5 with a size of 1.5mm from bottom to top. 1 / 3 (by volume). Raise the temperature of the adsorption tower to 80℃, and the volumetric space velocity is 500h -1 The crude isobutylene product stored at a constant temperature of 80°C is measured and passed from top to bottom under 0.1MPa. Sampling and analysis every 4h. The results are shown in Table 4.

Embodiment 2

[0044] Adopt the adsorption tower with a size of Φ100mm (inner)×1100mm, and fill with the 13X molecular sieves of 1.5mm size such as Comparative Example 1, Comparative Example 3 and Comparative Example 5 from bottom to top according to the volume ratio of 10:20:70. Shaped silicon aluminum and 5A molecular sieve. Raise the temperature of the adsorption tower to 80℃, and the volumetric space velocity is 500h -1 The crude isobutylene product stored at a constant temperature of 80°C is measured and passed from top to bottom under 0.1MPa. 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 products. Background technique [0002] Isobutylene is an important organic chemical raw material. When using isobutylene as the main raw material to make downstream products, the purity requirements of isobutylene are different due to different products, especially for the production of polymer-grade isobutylene. [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 amount of butyl rubber inner tubes, radial tires, medical bottle stoppers, and waterproof materials, the consumption of butyl rubber continues to increase, especially in China. According to the 2010-2015 China Synthetic Rubber Industry Investment Analysis and Forecast Report released by China Investment Consultants, the apparent consumption of butyl rubber in China was only 25,0...

Claims

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Application Information

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Patent Type & Authority Patents(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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