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Production method of light olefins
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A technology for low-carbon olefins and production methods, which is applied in ethylene production, biological raw materials, and in-molecular cracking to produce hydrocarbons, etc., can solve the problem of low selectivity of low-carbon olefins.
Active Publication Date: 2016-02-10
CHINA PETROLEUM & CHEM CORP +1
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Problems solved by technology
[0007] The technical problem to be solved by the present invention is the problem of low selectivity of low-carbon olefins existing in the prior art, and a new production method of low-carbon olefins is provided
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Embodiment 1～2
[0021] In a fast fluidized bed reactor, such as figure 1 As shown, the first reaction zone is a fast fluidized bed, the second reaction zone is a riser, and both the first regeneration zone and the second regeneration zone of the regenerator are turbulent fluidized beds. The raw material including methanol enters the first reaction zone of the reactor, and reacts to generate light olefins, and the gas phase product enters the subsequent separation section. After being stripped, part of the separated catalyst to be used is returned to the first reaction zone, and the other part enters the first regeneration zone to be regenerated by burning charcoal, and the regenerated catalyst in the first regeneration zone is returned to the first reaction zone. The rest of the catalyst in the first regeneration zone enters the second regeneration zone, the regenerated catalyst enters the second reaction zone to contact with raw materials, and the catalyst and product enter the separation zo...
Embodiment 3
[0025] According to the conditions described in Example 2, the average temperature in the first reaction zone is 400° C., the reaction pressure is 0.3 MPa in gauge pressure, pure methanol is fed, the methanol feed is 4.2 tons / hour, and the methanol weight hourly space velocity is 6 Hour -1 , the average carbon deposit of the catalyzer is 1% (weight), the catalyzer is SAPO-34, the reaction temperature in the second reaction zone is 500 ° C, the raw material is mixed carbon four, wherein the olefin content is 87%, and the mixed carbon four feed rate is 0.4 tons / hour, the reaction pressure is 0.3 MPa in gauge pressure, and the gas phase velocity is 5 m / s. Palladium / alumina CO combustion aid is added to the first regeneration zone, the content of palladium is 0.05% (weight), and the added amount accounts for 1% (weight) of the catalyst storage in the first regeneration zone. The carbon deposition amount of the regenerated catalyst in the first regeneration zone is 0.8% (weight), ...
Embodiment 4
[0027] According to the conditions described in Example 2, the average temperature of the first reaction zone is 460° C., the reaction pressure is 0.15 MPa in gauge pressure, pure methanol is fed, the methanol feed is 4.2 tons / hour, and the methanol weight hourly space velocity is 10 Hour -1 , the average carbon deposit of the catalyst is 2.7% (weight), the catalyst is SAPO-34, the reaction temperature in the second reaction zone is 620 ° C, the raw material is mixed carbon four, wherein the olefin content is 87%, and the mixed carbon four feed rate is 0.4 tons / hour, the reaction pressure is 0.15MPa in gauge pressure, and the gas phase velocity is 7 m / s. The carbon deposit of the regenerated catalyst in the first regeneration zone is 1.5% by weight, and the carbon deposit of the regenerated catalyst in the first regeneration zone is 0.05% by weight. The result of the experiment is: the carbon-based yield of low-carbon olefins at the outlet of the first reaction zone is 82.54%...
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Abstract
The invention relates to a production method of low-carbon olefins, which mainly solves the problem of low yield of low-carbon olefins in the prior art. The present invention comprises the following steps by adopting: (a) the raw material comprising methanol is contacted with the catalyst comprising silicoaluminophosphate molecular sieve in the first reaction zone of the reactor to generate the product stream I comprising light olefins, and simultaneously form the deactivated catalyst (b) the deactivated catalyst enters the first regeneration zone of the regenerator for regeneration, and the amount of carbon deposits on the catalyst that is regenerated in the first regeneration zone is between 0.8% and 2.5%, and at least a part returns to the first reaction zone; (c ) The remaining part of the catalyst in the first regeneration zone enters the second regeneration zone for regeneration to obtain a regenerated catalyst with a carbon deposition amount of less than 0.2%, enters the second reaction zone, and contacts with raw materials including carbon tetraolefins to generate a product stream including low-carbon olefins II; (d) The technical scheme in which the product stream II enters the gas-solid separation zone of the reactor and enters the separation section together with the product stream I better solves the above problems, and can be used in the industrial production of light olefins.
Description
technical field [0001] The invention relates to a method for producing low-carbon olefins. technical background [0002] Low-carbon olefins, namely ethylene and propylene, are two important basic chemical raw materials, and their demand is increasing. Generally, ethylene and propylene are produced through petroleum routes, but due to the limited supply and high price of petroleum resources, the cost of producing ethylene and propylene from petroleum resources continues to increase. In recent years, people have begun to vigorously develop the technology of converting alternative raw materials into ethylene and propylene. Among them, an important class of alternative raw materials for the production of light olefins are oxygenates, such as alcohols (methanol, ethanol), ethers (dimethyl ether, methyl ethyl ether), esters (dimethyl carbonate, methyl formate Esters), etc., these oxygenated compounds can be converted from coal, natural gas, biomass and other energy sources. Som...
Claims
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