Method for producing isobutene from MTO byproduct C4

An isobutene and by-product technology, applied in the field of isobutene production, can solve the problems of accelerated catalyst deactivation, low isobutene yield per pass, etc., and achieve the effects of low cost, high yield per pass, and low carbon deposition rate

Active Publication Date: 2016-06-29
CHINA PETROLEUM & CHEM CORP +1
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

If the existing n-butene skeletal isomerization technology is used to process C4 raw materials with high butadiene content, the deactivation of the catalyst will be significantly accelerated, resulting in the need for more frequent regeneration. Therefore, the existing technology usually requires The butadiene content in the butene raw material is less than 100ppm
In addition, if the existing n-butene skeletal isomerization technology is used to process C4 raw materials with n-butene content as high as 85wt%, in addition to generating isobutene, it will also co-produce a large amount of low-quality gasoline, which has the disadvantage of low isobutene per-pass yield

Method used

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  • Method for producing isobutene from MTO byproduct C4
  • Method for producing isobutene from MTO byproduct C4
  • Method for producing isobutene from MTO byproduct C4

Examples

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Embodiment 1

[0033] (1) The operating pressure of the hydrogenation reactor is 2.0MPa, the operating temperature is 65°C, and the space velocity is 5h -1 , H 2 The / butadiene molar ratio is 2.0, the diameter of the reactor is 1200mm, and the height is 3600mm. It is filled with two stages of amorphous nickel phosphide catalysts, a total of 3.9m 3 . Catalyst composition: Ni loading is based on the weight percentage of Ni metal weight in the total catalyst weight, P content and Ce content are expressed by P / Ni, Ce / Ni molar ratio respectively, Ni content is 10.12%, P / Ni=2.35, Ce / Ni Ni=0.01. Catalyst specific surface area 276m 2 / g, pressure test strength ≮60N / cm. The preparation process of the catalyst is as follows: 1) Weigh 49.5 grams of nickel nitrate and add 500 ml of deionized water, then add 0.05 mol / L nitric acid to adjust the pH value to 2-3, then add metered diammonium phosphate, cerium nitrate and citric acid ( CA), make P / Ni=2.5, Ce / Ni=0.01, CA / Ni=1 in the solution, and then st...

Embodiment 2

[0041] (1) The operating pressure of the hydrogenation reactor is 2.0MPa, the operating temperature is 95°C, and the space velocity is 5h -1 , H 2 The / butadiene molar ratio is 1.5, the diameter of the reactor is 1200mm, and the height is 3600mm. It is filled with two stages of amorphous nickel phosphide catalyst, a total of 3.9m 3 . Catalyst composition: Ni loading is based on the weight percentage of Ni metal weight in the total catalyst weight, P content and Ce content are expressed by P / Ni, Ce / Ni molar ratio respectively, Ni content is 14.96%, P / Ni=2.06, Ce / Ni Ni=0.03. Catalyst specific surface area 245m 2 / g, pressure test strength ≮60N / cm. The preparation process of the catalyst is as follows: 1) Weigh 74.3 grams of nickel nitrate and add 500 ml of deionized water, then add 0.05 mol / L nitric acid to adjust the pH value to 2-3, then add measured diammonium phosphate, cerium nitrate and citric acid ( CA), make P / Ni=3, Ce / Ni=0.03, CA / Ni=1.5 in the solution, and then st...

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Abstract

The invention discloses a method for producing isobutene from an MTO byproduct C4. The method comprises the following steps: (1) an MTO byproduct C4 raw material and hydrogen enters a hydrogenation reactor, and the content of butadiene is allowed to decrease to less than 100 ppm under the action of a selective hydrogenation catalyst; (2) hydrogen is separated from hydrogenation products and enters an n-butene skeletal isomerization reactor, and n-butene is isomerized into isobutene under the action of an isomerization catalyst; and (3) an isomerization product enters a gas-liquid separation tank and is cooled, a separated gaseous product and a separated liquid product both enter a fractionate tower, wherein the distance between the gaseous product and the top of the fractionate tower is 1 / 4 to 1 / 3 of the height of the fractionate tower and the distance between the liquid product and the top of the fractionate tower is 2 / 3 to 3 / 4 of the height of the fractionate tower, a mixed C4 product containing isobutene is extracted from the top of the fractionate tower, and C5<+> gasoline is extracted from the bottom of the fractionate tower. The method has the advantages of a low oil-generating ratio, short regeneration time and capability of processing a C4 raw material with high butadiene content.

Description

technical field [0001] The invention relates to a method for producing isobutene by using carbon four, a by-product of MTO, as a raw material. Background technique [0002] In 2011, the total production capacity of methyl tert-butyl ether (MTBE) plants in my country has exceeded 7.5 million tons per year, and the average operating rate of MTBE plants is only 60%. The supply of raw material isobutylene has become a bottleneck restricting the development of MTBE industry. [0003] At present, the isobutene resources in my country's market mainly come from the by-product C4 of catalytic cracking and ethylene cracking. Affected by the lightening of ethylene cracking raw materials and the domestic methanol-to-olefins (MTO) route, the output of cracked C4, which is the main source of isobutene, will decrease, and the future may face a situation of even more shortage of isobutene raw materials [0004] According to the statistics of the China Petroleum and Chemical Industry Feder...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C07C11/09C07C5/27B01J27/185B01J29/70
CPCY02P20/584
Inventor 周峰马会霞乔凯
Owner CHINA PETROLEUM & CHEM CORP
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