Method for preparing diesel fraction through direct conversion of methanol/dimethyl ether

A technology of dimethyl ether and methanol, which is applied in the field of diesel oil preparation, can solve the problems of high production cost and complex process, and achieve the effects of convenient operation, concentrated product distribution and mild reaction conditions

Active Publication Date: 2014-10-01
QINGDAO INST OF BIOENERGY & BIOPROCESS TECH CHINESE ACADEMY OF SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Syngas is converted into hydrocarbon products under the action of catalyst and certain reaction conditions, but the carbon number distribution of its hydrocarbon products is wide (such as from methane to C 100 above), and the further

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Example Embodiment

[0022] Example 1

[0023] Mix 2g H-beta zeolite with 0.8g pseudo-boehmite, add 3% (v / v) dilute nitric acid that can completely wet the zeolite and pseudo-boehmite, stir well, and dry at 110°C for 2h , And then calcined at 450℃ for 2h to make 40-60 mesh catalyst particles. The catalyst prepared above was put into a tubular reactor, activated at 500°C for 2h, and then cooled to a reaction temperature of 430°C. The raw material methanol was vaporized with nitrogen in a preheater at 120°C (the amount of nitrogen is generally 10-30ml / min) Mix into the reactor, the reaction pressure is 0.5MPa, and the methanol mass space velocity is 6h -1 , The reaction is 2h, the methanol conversion rate is 99.2%, and the diesel fraction hydrocarbon selectivity in the total hydrocarbon product is 5.8wt.%.

Example Embodiment

[0024] Example 2

[0025] Mix 2g of HY zeolite and 1g of silica, add 3% (v / v) dilute nitric acid until the powder is completely wetted, stir evenly, dry at 100℃ for 3h, and then roast it at 500℃ for 3h. 40-60 mesh catalyst particles. The catalyst prepared above was put into a tubular reactor, activated at 450°C for 3 hours, and then cooled to a reaction temperature of 390°C. The raw material dimethyl ether and inert carrier gas (the inert carrier gas is argon, and the amount of input is generally 10-30ml / min) Enter the reactor after mixing in a 120℃ preheater, the reaction pressure is 2MPa, and the mass space velocity of dimethyl ether is 2h -1 After 2 hours of reaction, the conversion of dimethyl ether was 95.6%, and the hydrocarbon selectivity of diesel fraction in the total hydrocarbon product was 21.8wt.%.

Example Embodiment

[0026] Example 3

[0027] Dissolve 0.73g of NaOH in 67.68g of deionized water, add 1.7g of sodium aluminate to the above solution, stir evenly, continue to stir and add 16g of silicic acid, and finally add 7.19g of 98wt.% hexamethyleneimine aqueous solution, continue to stir For 0.5h, put the above solution in a 40℃ water bath for aging for 24h, then put it into a stainless steel crystallization kettle lined with polytetrafluoroethylene to crystallize at 150℃ for 9 days, filter the resulting product, and wash with deionized water to a pH value of Neutral, dried overnight at 110°C, and then calcined at 550°C in an air stream for 8 hours to remove the template to obtain MCM-22 molecular sieve. Exchange the above-mentioned molecular sieve with 0.1M ammonium nitrate solution and then filter, wash and calcinate as described above. Ion exchange was repeated three times to obtain H-MCM-22 zeolite molecular sieve.

[0028] Take 2g H-MCM-22 zeolite and 1g silica, add 3% (v / v) dilute nitric...

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PUM

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Abstract

The invention relates to a method for preparing diesel fraction, and particularly relates to a method for preparing diesel fraction through direct conversion of methanol/dimethyl ether. In the invention, the methanol and/or dimethyl ether are/is converted into diesel fraction under certain reaction conditions by the catalyst effect. The catalyst consists of a molecular sieve and an adhesive, wherein the molecular sieve accounts for 60-90% of the catalyst by mass. In the reaction, the conversion rate of the raw material is greater than 90%, and the diesel fraction selectivity in the total hydrocarbon product is 3-56% by weight. The method provided by the invention has the remarkable characteristics of convenience in operation, mild reaction conditions, concentrated product distribution and convenience in subsequent separation operation, and further can obtain the diesel fraction with relatively high output; meanwhile, the problems of diesel shortage and supply tension are relieved to a certain degree.

Description

technical field [0001] The invention relates to a method for preparing diesel oil, in particular to a method for directly converting methanol / dimethyl ether to produce diesel fractions. Background technique [0002] World economic growth has brought huge market demand for liquid fuels, and petroleum resources are increasingly depleted. The development of synthetic liquid fuel technology has attracted the attention of countries all over the world. my country's energy structure is rich in coal, short of oil, and low in gas. Crude oil production is difficult to meet the growing demand for oil consumption. In 2013, my country's dependence on foreign crude oil approached 60% ("2012 Domestic and Foreign Oil and Gas Industry Development Report"). Therefore, the development and utilization of non-petroleum routes to produce clean liquid fuels has important strategic significance for my country's energy security and sustainable social development. In recent years, in my country's li...

Claims

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Application Information

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IPC IPC(8): C10G3/00
CPCY02P20/52Y02P30/20
Inventor 吴晋沪张雷王辉韩德志刘广波李建青王博周小龙
Owner QINGDAO INST OF BIOENERGY & BIOPROCESS TECH CHINESE ACADEMY OF SCI
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