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A method for producing isobutylene by cracking methyl tert-butyl ether

A technology of methyl tert-butyl ether and isobutylene, applied in chemical instruments and methods, purification/separation of hydrocarbons, preparation of hydroxyl compounds, etc., can solve problems such as difficult control of operating conditions, increased investment and operating costs of water washing towers, and achieve Effects of reduced workload, ease of operation, and reduced energy consumption

Active Publication Date: 2017-01-04
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 control of operating conditions is more difficult.

Method used

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  • A method for producing isobutylene by cracking methyl tert-butyl ether
  • A method for producing isobutylene by cracking methyl tert-butyl ether

Examples

Experimental program
Comparison scheme
Effect test

preparation example Construction

[0033] 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.

[0034] figure 2 It is a schematic diagram of the process for preparing high-purity isobutene of the present invention. After MTBE is firstly refined through MTBE refining tower 1, it enters cracking reactor 2 for cracking reaction under suitable operating conditions. After cooling, the cracked product first enters a packed tower 8, and the g...

Embodiment 1~4

[0039] The used flow process of embodiment 1~4 is as figure 2 , the operating conditions of each device are shown in Table 2, the properties of the packing used in the packed tower are shown in Table 3, the properties of the adsorbent used in the adsorption tower are shown in Table 4, and the composition of methanol and isobutylene products in each example is shown in Table 5.

[0040] The fillers in Table 3 are installed in a vertical cylindrical packed tower.

[0041] The specific surface area of ​​the activated carbon powder used in the embodiment is 880m 2 / g, the pore volume is 0.71mL / g; the SiO of 13X molecular sieve 2 / Al 2 o 3 The mole is 2.9, and the specific surface area is 780m 2 / g, the total pore volume is 0.36mL / g; the specific surface area of ​​silica gel is 510m 2 / g, the pore volume is 0.85mL / g.

[0042] The adsorbent in the embodiment is to mix the above-mentioned activated carbon (molecular sieve) or according to a certain weight ratio (with silica ge...

Embodiment 1

[0043] In embodiment 1, the mixture of activated carbon, 13X molecular sieve and silica gel is used as adsorbent; in embodiment 2, the mixture of activated carbon and 13X molecular sieve is used as adsorbent; in embodiment 3, activated carbon is used as adsorbent; in embodiment 4, 13X molecular sieve is used as adsorbent.

[0044] Table 2 Operating conditions of each device

[0045] 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 packed tower Operating temperature, °C - 40 20 50 30 Methanol recovery rate, v% - 95.2 97.6 93.3 96.1 Wash tower Operating temperature, °C 40 - - - - Operating pressure, MPa 0.05 - - - - Washing water / material mass ratio ...

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Abstract

The invention discloses a method for producing isobutylene from methyl tert-butyl ether by pyrolysis. The method includes performing a pyrolysis reaction of methyl tert-butyl ether in a reactor, cooling the pyrolysis product to below 75 DEG C by heat exchange, allowing the cooled product to enter a packed tower with a constant temperature of 20 DEG C-40 DEG C for separation, discharging a gas phase product from the top of the packed tower, allowing to enter an adsorption tower filled with an adsorbent, and allowing the product discharged from the top of the adsorption tower to enter an isobutylene heavy removing column and an isobutylene light removing column in sequence, to obtain the isobutylene product. The inventive method dispenses with a water washing tower and a methanol recovery tower although adopting the packed tower and the adsorption tower, so as to greatly reduce workload of a methanol rectification tower, lower energy consumption, and make easy operation of a device; and the isobutylene product can meet 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 method 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 Chin...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C07C11/09C07C1/20C07C7/12C07C7/13C07C7/00C07C31/04C07C29/00
Inventor 张淑梅乔凯翟庆铜陈明郭长新王春梅
Owner CHINA PETROLEUM & CHEM CORP
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