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Method for preparing light olefins from alcohols

A technology for low-carbon olefins and compounds, which is applied in the field of preparing low-carbon olefins from alcohol compounds, can solve the problems of reduced methanol conversion rate, influence on methanol dehydration reaction, etc. acrylic effect

Active Publication Date: 2013-11-06
CHINA PETROLEUM & CHEM CORP +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, injecting a large amount of water vapor will directly affect the dehydration reaction of methanol, resulting in a decrease in methanol conversion rate.

Method used

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  • Method for preparing light olefins from alcohols
  • Method for preparing light olefins from alcohols
  • Method for preparing light olefins from alcohols

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0050] Example 1 illustrates the effect of using the method provided by the invention to carry out catalytic conversion of methanol to produce light olefins.

[0051] The methanol conversion experiment was carried out on a medium-sized device with continuous reaction-regeneration operation. The reactor form adopts the riser + fluidized bed mode, and the catalyst is MMC-2. The lower first reaction zone of the fluidized bed reactor is a riser reactor with an inner diameter of 16 mm and a height of 4 meters; the outlet of the riser reactor is located at the bottom of the dense phase bed in the upper second reaction zone, and the inner diameter of the second reaction zone is It is 64 mm and the height is 2.5 meters. The catalyst cooler has a diameter of 70mm and a height of 3m.

[0052] The catalyst and raw materials used are the same as those in the comparative example. The catalyst after reaction at 430°C from the second reaction zone first passes through the catalyst cooler, c...

Embodiment 2

[0054] Example 2 illustrates the effect of using the method provided by the invention to carry out catalytic conversion of methanol to produce light olefins.

[0055] With MTO-100 as the catalyst, the form of the fluidized bed reactor is: the first reaction zone is a fast fluidized bed reactor, the diameter of the dense phase fluidized section is 50 mm, and the length is 4 meters. The reaction in the first reaction zone The temperature is 280°C and the bed weight hourly space velocity is 10h -1 . The structure of the second reaction zone is the same as in Example 1, the reaction temperature is 380°C, and the bed weight hourly space velocity is 3h -1 , The reaction pressure is 0.15MPa (gauge pressure). Water vapor is injected at the bottom of the second reaction zone to reduce the partial pressure of the reacted hydrocarbons, and the weight ratio of injected water to methanol is 50:50. All the other test conditions are the same as in Example 1, and the test results are shown...

Embodiment 3

[0057] Example 3 illustrates the effect of using the method provided by the invention to carry out catalytic conversion of methanol to produce light olefins.

[0058] With MTO-100 as the catalyst, the form of the fluidized bed reactor is: the first reaction zone is a fast bed with a bed diameter of 50 mm and a bed height of 1.5 meters; the outlet of the fast bed reactor passes through a section with a diameter of 16 mm and a height of 2.5 The dilute-phase conveying pipe of m is in fluid communication with the bottom of the dense-phase bed in the upper second reaction zone, and an open-hole distribution plate is set at the outlet of the dilute-phase conveying pipe, and the superficial gas velocity of the gas passing through the open-hole distribution plate is 8m / s; the structure of the second reaction zone is basically the same as that of Example 1, except that the regenerated catalyst does not directly enter the dense phase bed of the second reaction zone but enters the middle...

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Abstract

The invention relates to a method for preparing light olefins from alcohols. The method comprises a fluidized-bed reactor, a catalyst regeneration system, a stripper and a reaction product subsequent separation system, wherein the fluidized-bed reactor is divided into a first reaction area and a second reaction area; the method comprises the steps of: introducing a raw material, namely the alcohols into the first reaction area and performing dehydration reaction by contacting a catalyst; allowing a reacted gas stream and the catalyst to enter the second reaction area and continuously reacting by contacting another stream of catalyst which is regenerated by burning; performing cracking on a main product of dehydration of the alcohols to obtain the light olefins; separating the gas stream after the reaction and the to-be-regenerated catalyst; allowing the separated gas stream to enter the subsequent separation system; allowing the separated to-be-regenerated catalyst to enter the first reaction area after cooling the separated catalyst by exchanging heat; and recycling the other part of the catalyst after stream stripping and regeneration. The method provided by the invention has the advantages of improving the conversion rate of methanol, improving the selectivity of propylene in the reaction product, fulfilling the aim of increasing the propylene yield, and simultaneously contributing to realizing large-scale continuous production.

Description

technical field [0001] The invention relates to a method for preparing low-carbon olefins from alcohol compounds, in particular to a method for preparing low-carbon olefins, especially propylene, from methanol or ethanol. Background technique [0002] Ethylene and propylene are the basic raw materials for many important chemical products such as ethylene oxide, polyethylene, polyvinyl chloride and polypropylene. With the development of the world economy, the demand for low-carbon olefins is increasing day by day. According to the research report submitted by the American Chemical Market Consulting Company (CMAI), the global supply of propylene will increase from 57.6 million tons in 2003 to 80.3 million tons in 2010, with an average The annual growth rate is 5%; by 2010, the global ethylene demand will reach 140Mt / a. Due to the rapid growth of my country's economy, the annual growth rate of my country's ethylene and propylene demand exceeds the world average. [0003] Ther...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C07C1/20C07C11/02C07C11/06
CPCY02P20/52Y02P20/584
Inventor 龙军达志坚侯栓弟许克家罗一斌宗保宁张占柱武雪峰张同旺
Owner CHINA PETROLEUM & CHEM CORP
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