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Method for producing propylene by carbinol or dimethyl ether

A technology of dimethyl ether and methanol, applied in the field of highly selective preparation of propylene

Active Publication Date: 2008-05-14
DALIAN INST OF CHEM PHYSICS CHINESE ACAD OF SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0005] Since methanol conversion is a strong exothermic process, and the existing technology uses a fixed-bed reaction method, reaction heat extraction is a difficult problem faced by large-scale industrial production
At the same time, the selectivity of propylene as the target product is only 70%

Method used

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  • Method for producing propylene by carbinol or dimethyl ether

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Experimental program
Comparison scheme
Effect test

Embodiment 1

[0031] SiO 2 / Al 2 o 3 =200 ZSM-5 zeolite is the active component, and the first catalyst for methanol conversion is prepared by leaching La, Mg, spray drying, water treatment, online silanization and other processes. A fluidized bed reaction process is adopted, and 70% methanol aqueous solution is used as a raw material. The fluidized bed reaction conditions are: temperature 502°C, pressure (gauge pressure) 0.03MPa, methanol feed / first catalyst circulation rate 1.0, space velocity (calculated as pure methanol) 5h -1, the residence time of the first catalyst in the reactor is 90min, the residence time of the reaction gas is 5s, and the regeneration temperature of the first catalyst is 620°C. The reaction result is as follows: methanol conversion rate 99.2%, product distribution: methane 0.61%, carbon oxide (CO+CO 2 ) 0.83%, ethane + propane 1.03%, ethylene 5.24%, propylene 50.10%, C 4 The above alkanes and alkenes are 38.94%, and aromatics are 3.25%.

[0032] According t...

Embodiment 2

[0036] Using ZSM-5 as the active component, with Al 2 o 3 As a binder, the oil injection molding process is used to make a moving bed catalyst, and the catalyst is modified to make the first moving bed catalyst for methanol conversion to propylene. Using moving bed reaction process, 70% methanol aqueous solution as raw material, reaction temperature is 480°C, pressure (gauge pressure) 0.1MPa, methanol feeding space velocity (calculated as pure methanol) 5h -1 , the average residence time of the first catalyst in the reactor is 30h, and the residence time of the reaction gas is 3s. Reaction result: the conversion rate of methanol is 99.6%. Product distribution: methane 0.37%, carbon oxides (CO+CO 2 ) 0.63%, ethane + propane 0.96%, ethylene 4.39%, propylene 55.07%, C 4 The above alkanes and alkenes are 36.40%, and aromatics are 2.18%.

[0037] Pass methanol and light components (mixed light components according to the material composition after methanol conversion, includin...

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Abstract

The invention relates to a method for preparing olefin by methanol or dimethyl ether, in particular to a high selectivity preparation method of propylene, which comprises a conversion reaction of methanol or dimethyl ether, alkylation of methanol and ethylene and a catalytic cracking reaction of a plurality of heavy components above C4. A hydrocarbon mixture rich in propylene is generated by preheated material contacting with a first catalyst in a circulating fluidized bed or a moving bed reactor. After the propylene is separated from the hydrocarbon mixture, a plurality of light components of the hydrocarbon mixture comprising hydrogen and methane return to a methanol conversion reactor, the propylene is generated by the alkylation of methanol and ethylene in the light components. The invention is characterized in that the C4 and the heavy components above C4 separated from separation system are contacted with cracking catalyst in the circulating fluidized bed, generating hydrocarbonmixture contained ethylene, propylene and other light components by the catalytic cracking reaction, then the hydrocarbon mixture returns to the separation system for obtaining propylene.

Description

technical field [0001] The invention relates to the technical field of chemical industry, and relates to a method for preparing olefins from methanol or dimethyl ether, in particular to preparing propylene with high selectivity. Background technique [0002] Propylene is a basic organic chemical raw material with a particularly large demand, mainly from petroleum processing. With the increasing scarcity of petroleum resources, the development of technology to produce propylene from non-petroleum resources such as coal or natural gas has attracted more and more attention at home and abroad. It is a mature process technology to produce synthesis gas from coal or natural gas, and then to produce methanol and dimethyl ether from the synthesis gas. Therefore, the production of propylene from methanol or dimethyl ether is a key technology in the coal-to-olefins route. [0003] Compared with the process of methanol to olefins (ethylene, propylene) (MTO), the process of methanol t...

Claims

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Application Information

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IPC IPC(8): C07C11/06C07C1/20
CPCY02P20/52Y02P30/20Y02P30/40
Inventor 刘中民王华吕志辉齐越许磊张今令袁翠峪李冰
Owner DALIAN INST OF CHEM PHYSICS CHINESE ACAD OF SCI
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