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Aromatization method for producing light aromatics

A light aromatics, aromatization technology, applied in chemical instruments and methods, bulk chemical production, organic chemistry, etc., can solve the problems of low conversion rate, poor combustion quality, waste of resources, etc., to achieve high conversion rate, raw material Wide range of sources and reduced dry gas yield

Active Publication Date: 2013-04-24
CHINA PETROLEUM & CHEM CORP +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0002] The utilization rate of refinery gas in my country is very low, mainly due to the separation of olefins as raw materials for alkylation or composite gasoline or the production of petroleum product additives. The total utilization rate is less than 20%. With the improvement of refining processing capacity and the newly developed The application of catalytic cracking process (MGG) to produce olefins and liquefied gas and heavy oil catalytic cracking to produce light olefins (DCC) has increased the yield of light hydrocarbons year by year, but most of them are used as civil fuels, resulting in waste of resources; And because the high olefin content leads to poor combustion quality, it is easy to cause pollution to the environment
[0012] CN100999433A discloses a method for lightening and transalkylation of heavy aromatics, which mainly solves the problem of low conversion rate when the single pure zeolite molecular sieve catalyst in the prior art is used for lightening and transalkylation of heavy aromatics , the need to load precious metals and strict requirements on the composition of raw materials

Method used

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  • Aromatization method for producing light aromatics
  • Aromatization method for producing light aromatics
  • Aromatization method for producing light aromatics

Examples

Experimental program
Comparison scheme
Effect test

preparation example Construction

[0033] The preferred preparation method of above-mentioned catalyst comprises the steps:

[0034] (1) After peptizing the precursor of the binder with acid, adding ZSM series zeolite and stirring to form a slurry, then dropping the slurry into an oil ammonia column to form a ball, drying and roasting the pellet to obtain a carrier,

[0035] (2) The carrier is impregnated with an impregnating solution prepared from a compound containing zinc, a compound containing rare earth elements and a compound containing group VA elements, then dried and calcined.

[0036] In the above method, step (1) is carrier preparation. First, the precursor of the binder is peptized with an acid. The acid can be nitric acid, hydrochloric acid, formic acid or acetic acid, preferably nitric acid, and the precursor of the binder is preferably pseudoboehmite. stone. When peptizing, the suitable ratio of the mass of the acid to the alumina contained in the pseudo-boehmite is 0.02-0.20:1, preferably 0.04-...

example 1

[0044] Preparation of the aromatization catalyst used in the present invention.

[0045] Get the pseudo-boehmite powder of 67.6 grams (Sasol company produces, SB, the alumina content is 74% by mass), under stirring conditions, it was added into 300 ml of nitric acid aqueous solution with a concentration of 1.1% by mass, stirred for 2 hours to peptize, and 55.0 grams of HZSM-5 with a silica / alumina molar ratio of 60 was added Zeolite powder (95% zeolite content), stirred at high speed for 3 hours. Drop the prepared slurry into an oily ammonia column containing 8% by mass of ammonia water, take out the wet ball formed in the oily ammonia column, dry at 60°C for 10 hours, and roast at 550°C for 3 hours to obtain 50% by mass of HZSM-5 zeolite and carrier pellets of 50% by mass alumina.

[0046] Get 50 grams of carrier pellets, use 60 grams of zinc nitrate containing 8.8 mass %, mixed rare earth chloride 1.3 mass % (wherein lanthanum oxide accounts for 31 mass %, cerium oxide 51...

example 2～4

[0048] The following examples carry out the evaluation of the aromatization reaction of mixed carbon four and heavy aromatics, the mixed carbon four and C used in the reaction 9 + The compositions of heavy aromatics are shown in Table 1 and Table 2, respectively.

[0049] Will 1 # Hybrid carbon four and C 9 + Heavy aromatics are mixed and loaded into the raw material tank according to a certain mass ratio, and the raw material oil is sent into the reactor by a metering pump into a 20 ml fixed-bed continuous flow reactor filled with 10 grams of catalyst A for reaction. Feed quality space velocity 0.7 hours -1 Carry out aromatization reaction under the condition of , the obtained product distribution is shown in Table 3.

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Abstract

The invention relates to an aromatization method for producing light aromatics, which comprises the step of making C4 hydrocarbon and C9+ heavy aromatics which are used as raw materials react with aromatization catalysts at 400 to 600 DEG C through sufficient contact under the condition without hydrogen. The method can greatly improve the yield of the light aromatics, can also reduce the dry gas yield and can provide an economic and effective path of processing remained light aromatics and heavy aromatics resources for the refinery.

Description

technical field [0001] The invention is an aromatization method for producing aromatic hydrocarbons, specifically, a method for producing benzene, toluene and xylene through the aromatization reaction of light hydrocarbons. Background technique [0002] The utilization rate of refinery gas in my country is very low, mainly due to the separation of olefins as raw materials for alkylation or composite gasoline or the production of petroleum product additives. The total utilization rate is less than 20%. With the improvement of refining processing capacity and the newly developed The application of catalytic cracking process (MGG) to produce olefins and liquefied gas and heavy oil catalytic cracking to produce light olefins (DCC) has increased the yield of light hydrocarbons year by year, but most of them are used as civil fuels, resulting in waste of resources; And because the high olefin content leads to poor combustion quality, it is easy to cause pollution to the environment....

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C07C4/18C07C5/41C07C15/04C07C15/06C07C15/08C10G29/16C10G29/04C10G29/02
CPCY02P20/52
Inventor 陈春芳于中伟王子健孙义兰
Owner CHINA PETROLEUM & CHEM CORP
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