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A kind of method that methanol/dimethyl ether is directly converted into diesel oil fraction

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

Active Publication Date: 2016-01-20
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 utilization of the high carbon number hydrocarbons generated (such as being converted into liquid fuels) must carry out secondary process treatment, the process is complicated, and the production cost is high (CN1417292A, CN1418933A)

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0023] Mix 2g of H-beta zeolite with 0.8g of pseudo-boehmite, add dilute nitric acid with a concentration of 3% (v / v) that can completely wet the zeolite and pseudo-boehmite, stir evenly, and dry at 110°C for 2h. Then it was calcined at 450° C. for 2 hours to make catalyst particles of 40-60 mesh. Put the catalyst prepared above into a tubular reactor, activate it at 500°C for 2 hours, then cool down to the reaction temperature of 430°C, and gasify the raw material methanol with nitrogen in a preheater at 120°C (the amount of nitrogen introduced is generally 10-30ml / min) mixed into the reactor, the reaction pressure is 0.5MPa, and the mass space velocity of methanol is 6h -1 , reacted for 2h, the conversion rate of methanol was 99.2%, and the selectivity of diesel fraction hydrocarbons in the total hydrocarbon products was 5.8wt.%.

Embodiment 2

[0025] Mix 2g of H-Y zeolite with 1g of silicon oxide, add dilute nitric acid with a concentration of 3% (v / v) until the powder is completely wetted, stir evenly, dry at 100°C for 3h, and then roast it at 500°C for 3h. into 40-60 mesh catalyst particles. Put the catalyst prepared above into a tubular reactor, activate it at 450°C for 3h, then cool down to the reaction temperature of 390°C, the raw material dimethyl ether and the inert carrier gas (the inert carrier gas is argon, the amount of feed is generally 10-30ml / min) mixed in a preheater at 120°C and then enters the reactor, the reaction pressure is 2MPa, and the mass space velocity of dimethyl ether is 2h -1 , reacted for 2 hours, the conversion rate of dimethyl ether was 95.6%, and the selectivity of diesel fraction hydrocarbons in the total hydrocarbon products was 21.8wt.%.

Embodiment 3

[0027] Dissolve 0.73g of NaOH in 67.68g of deionized water, add 1.7g of sodium aluminate to the above solution, stir well, continue to stir and add 16g of silicic acid, finally add 7.19g of 98wt.% hexamethyleneimine aqueous solution, continue to stir for 0.5 h, put the above solution in a 40°C water bath for 24h, then put it into a stainless steel crystallization kettle with a polytetrafluoroethylene liner at 150°C for 9 days, filter the obtained product, and wash with deionized water until the pH value reaches medium properties, dried overnight at 110°C, and then calcined at 550°C for 8 hours in an air stream to remove the template agent to obtain MCM-22 molecular sieves. The above-mentioned molecular sieves were ion-exchanged with 0.1M ammonium nitrate solution, and then filtered, washed and calcined as described above, so that the ions The exchange was repeated three times to obtain H-MCM-22 zeolite molecular sieve.

[0028] Mix 2g of H-MCM-22 zeolite with 1g of silicon oxi...

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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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Patent Type & Authority Patents(China)
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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