Process for preparing isobutene through methyl tertiary-butyl ether cracking

A technology of methyl tert-butyl ether and isobutylene, which is applied in the field of production of polymer-grade isobutylene, which can solve the problems of difficult control of operating conditions, increased investment and operating costs of washing towers, etc., to improve washing effect, reduce washing burden, and reduce water consumption Effect

Active Publication Date: 2015-05-06
CHINA PETROLEUM & CHEM CORP +1
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, the water washing tower added by this method increases the investme...

Method used

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  • Process for preparing isobutene through methyl tertiary-butyl ether cracking
  • Process for preparing isobutene through methyl tertiary-butyl ether cracking

Examples

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preparation example Construction

[0031] 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 bottom product of water washing tower 3 enters methanol recovery tower 4 and methanol refining tower in turn. 5. Methanol is recovered, and the crude isobutene product from the top of the water washing tower 3 enters the isobutene de-weighting tower 6 and the isobutene de-lightening tower 7 in turn to obtain high-purity isobutene.

[0032] figure 2 It is a schematic diagram of the process for preparing high-purity isobutene of the present invention. MTBE is first refined through the MTBE refining tower 1, and then enters the cracking reactor 2 for cracking reaction under suitable operating conditions. After cooling, the cracked product first enters a separator 8, and th...

Embodiment 1~4

[0037] The used flow process of embodiment 1~4 is as figure 2 , the operating conditions of each device are shown in Table 2, the description of the separator is shown in Table 3, and the composition of methanol and isobutylene products in each example is shown in Table 4.

[0038] Table 2 Operating conditions of each device

[0039] operating conditions Comparative example 1 Example 1 Example 2 Example 3 Example 4 reactor Reaction temperature, °C 220 220 220 220 220 Reaction pressure, MPa 0.16 0.16 0.16 0.16 0.16 MTBE liquid hourly space velocity, h -1 2.5 2.5 2.5 2.5 2.5 Splitter Operating temperature, °C - 50 20 25 30 Methanol recovery rate, v% - 93.5 94.3 91.3 94.6 Wash tower Operating temperature, °C 40 40 40 40 40 Operating pressure, MPa 0.05 0.05 0.05 0.05 0.05 Washing water / material mass ratio 1.8 0.2 0.2 0.1 ...

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Abstract

The invention discloses a process method for preparing isobutene through methyl tertiary-butyl ether cracking. According to the invention, methyl tertiary-butyl ether is subjected to a cracking reaction in a reactor; an obtained cracking product is subjected to heat exchange cooling until the temperature is higher than 50 DEG C and no higher than 90 DEG C; an obtained cooling product is separated in a separator; a gas-phase product is discharged from the upper part of the separator, and enters a water washing tower; a product discharged from the upper part of the water washing tower sequentially enters an isobutene de-heavy tower and an isobutene de-light tower, such that an isobutene product is obtained. According to the method, water consumption of the water washing tower is reduced, and washing effect of the water washing tower is improved. Also, methanol recovery tower and methanol rectification tower work loads are greatly reduced, and energy consumption is reduced. The prepared isobutene can reach polymerization-grade requirements.

Description

technical field [0001] The invention relates to a method for producing isobutene by cracking methyl tert-butyl ether (MTBE), especially a process for producing polymer-grade isobutene. 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 Chi...

Claims

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Application Information

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IPC IPC(8): C07C11/09C07C1/20C07C31/04C07C29/10C07C7/04C07C29/80
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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