Aromatization method without hydrogen for light hydrocarbon

An aromatization and non-hydrogenation technology, which is used in the production of aromatic hydrocarbons or clean gasoline components and the production of high-quality liquefied gas. The effect of increasing elasticity

Active Publication Date: 2012-01-25
CHINA PETROLEUM & CHEM CORP +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The aromatization reaction can be carried out in moving bed, fluidized bed or fixed bed, but no specific catalyst regeneration method is given

Method used

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  • Aromatization method without hydrogen for light hydrocarbon
  • Aromatization method without hydrogen for light hydrocarbon
  • Aromatization method without hydrogen for light hydrocarbon

Examples

Experimental program
Comparison scheme
Effect test

example 1

[0058] (1) Preparation of composite carrier

[0059] Take 67.6 kg of pseudo-boehmite powder (produced by Sasol Company, SB, alumina content 74 mass %), under stirring conditions, added to 300 kg of nitric acid aqueous solution with a concentration of 1.1 mass %, after stirring for 2 hours to peptize, add 55.0 kg of silica / alumina molar ratio of 60 HZSM- 5 Zeolite powder (91% zeolite content), stirring at high speed for 3 hours. The prepared slurry was dropped into an oil-ammonia column containing 8% by mass of ammonia water, and the wet bulb formed in the oil-ammonia column was taken out, dried at 60° C. for 10 hours, and calcined at 550° C. for 3 hours to obtain a composite carrier containing HZSM- 5 zeolite 50 mass % alumina pellets.

[0060] (2) Preparation of catalyst

[0061] Take 50 kilograms of composite carrier, use 50 kilograms containing 4.7% by mass of zinc nitrate, 3.0% by mass of chlorinated mixed rare earth (31% of lanthanum oxide, 51% of cerium oxide, 14% of...

example 2

[0064] according to figure 1 Shown in the process flow, using the catalyst prepared in Example 1, with 60 mass % of the straight-run naphtha shown in Table 1 and 40 mass % of the light hydrocarbons shown in Table 2 as raw materials to carry out the aromatization reaction test, the reaction is in It is carried out under non-hydrogen conditions. The raw material inlet temperature of each reactor was controlled to be 400 °C, the reaction pressure was 0.5 MPa, and the mass space velocity of the raw material was 0.5 h. -1 . The light hydrocarbons are evenly divided into two strands, one strand is mixed with straight-run naphtha and then enters the first reactor through the heating furnace, and the other strand of light hydrocarbons directly enters the second reactor 111 in the form of cold feed. The pressure of the regenerator is 0.7MPa, the inlet temperature of the regeneration gas in the first-stage coking zone is 470°C, and the oxygen content is 0.5% by volume; the inlet tempe...

example 3

[0066] according to figure 2The shown process flow, using catalyst A, with 60% by mass of straight-run naphtha shown in Table 1 and 40% by mass of the light hydrocarbons shown in Table 2 as raw materials to carry out the aromatization reaction test, the reaction is non-hydrogenated. conditions. The operating conditions of the reaction part and the regenerator, the residence time of the catalyst to be produced in the coking zone, and the temperatures in the drying zone and the cooling zone are the same as those in Example 2, except that the regeneration gas enters the two-stage coking zone from the middle. The test results are shown in table 3.

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Abstract

The invention relates to a non-hydrogen aromatization method of light hydrocarbons that comprises the following steps: (1) mixing naphtha with C3 to C5 light hydrocarbons, adding into a moving bed reaction zone, contacting with aromatization catalyst to carry out aromatization reaction, adding the spent catalyst flowing from the bottom of the moving bed reaction zone into a catalyst regenerator from the top through a spent catalyst elevator, a spent catalyst riser pipe, a spent catalyst separation hopper and a pressure transformation and flow control zone, passing through the buffer zone, a burning zone, a drying zone and a cooling zone in the catalyst regenerator sequentially from top to bottom, introducing oxygen-containing regeneration gas in the burning zone to burn and regenerate the spent catalyst, lifting the regenerated catalyst, and adding into the moving bed reactor from the top. The method can transform low-octane naphtha and low-carbon hydrocarbons into high-octane petrol and high-quality liquefied gas, and has the advantages of large generation operation flexibility, low energy consumption, good catalyst regeneration effect and long service life.

Description

technical field [0001] The present invention is a method for non-hydrogenation aromatization of light hydrocarbons. Specifically, it is a kind of low-octane naphtha and C in a moving bed reaction-continuous regeneration device. 3 ~C 5 A method for producing aromatic hydrocarbons or clean gasoline components by using a mixture of light hydrocarbons as raw materials, and at the same time producing high-quality liquefied gas. Background technique [0002] With the introduction of unleaded gasoline and new gasoline standards, some low-octane gasoline, such as reformed topping oil, condensate, partially hydrocoked gasoline and straight-run gasoline and other light naphthas are in urgent need of suitable processing technology. Although this part of naphtha is suitable for ethylene feedstock, it is difficult to transport due to its high vapor pressure. If there is no ethylene plant near the enterprise, it is difficult to use it as ethylene feedstock. At present, catalytic refor...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C10G35/12
Inventor 王杰广马爱增于中伟任坚强
Owner CHINA PETROLEUM & CHEM CORP
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