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Prehydrogenation treatment method for carbon-4 alkylation raw material

The technology of a carbon tetraalkyl group and a treatment method is applied in the field of pretreatment of selective hydrogenation of butadiene, which can solve the problems of deactivation, easy agglomeration and poisoning of active components, prolong the service life and improve the hydrogenation selection. Properties and stability, the effect of suitable acidity

Active Publication Date: 2018-11-23
PETROCHINA CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0013] The active components of conventional noble metal catalysts are prone to agglomeration and poisoning and deactivation during the reaction process, and the dispersion of palladium metal is a problem that many researchers are trying to solve

Method used

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  • Prehydrogenation treatment method for carbon-4 alkylation raw material
  • Prehydrogenation treatment method for carbon-4 alkylation raw material
  • Prehydrogenation treatment method for carbon-4 alkylation raw material

Examples

Experimental program
Comparison scheme
Effect test

preparation example Construction

[0054] Embodiment uses the preparation of catalyst 1~6

[0055] Preparation of Catalyst C1:

[0056] Dilute 1L concentration to 200g Al 2 o 3 / L of sodium metaaluminate solution is placed in a stainless steel container with a stirrer and gas can be introduced into the bottom of the tank, the nickel nitrate solution is prepared and placed in a high-position container, a mixed gas of carbon dioxide and air is introduced, and the peristaltic pump is started at the same time Control the flow rate and drop the prepared nickel nitrate solution, the carbon dioxide concentration in the mixed gas is 60v%, and the flow rate is 4Nm 3 / h, the reaction temperature is 35°C, the pH value at the end of the reaction is 9.0, stop feeding carbon dioxide, age for 30 minutes, filter and separate the mother liquor, wash, and dry at 110°C for 6 hours to obtain nickel-containing pseudo-boehmite.

[0057] Mix and knead nickel-containing pseudo-boehmite with nitric acid, water, potassium carbonate, ...

Embodiment 1

[0083] Catalyst C1 was used, and the catalyst was reduced at 100°C for 6h under hydrogen atmosphere. The reaction inlet temperature is 48°C, the reaction pressure is 1.4MPa, and the liquid space velocity is 7h -1 , the molar ratio of hydrogen to butadiene is 5.0, and Table 2 is the composition of the materials before and after the reaction.

[0084] Material composition before and after table 2 reaction

[0085]

Embodiment 2

[0087] Catalyst C2 was used, and the catalyst was reduced at 80°C for 6h under hydrogen atmosphere. The reaction inlet temperature is 40°C, the reaction pressure is 1.2MPa, and the liquid space velocity is 8h -1 , the molar ratio of hydrogen to butadiene is 4.5, and Table 3 is the composition of the materials before and after the reaction.

[0088] Table 3 Composition of materials before and after reaction

[0089]

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Abstract

The invention relates to a prehydrogenation treatment for a carbon-4 alkylation raw material. According to the prehydrogenation treatment method, a palladium-molybdenum series catalyst and a fixed bedreactor are utilized; hydrogenation process conditions are that a reaction temperature is 30 to 75 DEG C, reaction pressure is 1 to 3MPa, a liquid space velocity is 2 to 10h<-1>, and a molar ratio ofhydrogen to butadiene is 1 to 10; the palladium-molybdenum series catalyst is prepared from an aluminum oxide carrier containing nickel with a specific crystal form, so that the catalyst has appropriate acidity and a higher reactive metal utilization rate, and butadiene hydrogenation activity and selectivity of the catalyst are remarkably improved. By means of the hydrogenation treatment method disclosed by the invention, a carbon-4 alkylation raw material pretreatment device can effectively remove impurity butadiene at a higher feeding space velocity under the situation that monoolefine in ahydrogenation product is fundamentally not lost; thus, very obvious and good effects of improving environmental benefits and economic benefits of a follow-up alkylation device are achieved.

Description

technical field [0001] The invention relates to a pretreatment method for selective hydrogenation of butadiene in C4 alkylation raw materials. Background technique [0002] C4-alkylated gasoline has the characteristics of high octane number, low sulfur, and low olefins. It is an ideal gasoline blending component and an important means to upgrade domestic gasoline quality. With the increasingly stringent domestic environmental protection regulations, the quality upgrade of refined oil will surely promote the rapid development of C4-alkylated gasoline industry. The feedstock used in the hydrofluoric acid (or sulfuric acid) alkylation unit of a refinery usually comes from the mixed C4 fraction produced by the catalytic cracking unit, which generally contains thousands of 10 -6 (ppm) of butadiene, because diolefins will react with acid to generate corresponding esters to increase acid consumption, and at the same time generate viscous heavy oil (ASO), which will increase the dr...

Claims

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Application Information

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IPC IPC(8): C10G45/40B01J23/89B01J35/10B01J37/02B01J37/03B01J37/08
CPCC10G45/40B01J23/002B01J23/892B01J37/0201B01J37/031B01J37/082B01J2523/00C10G2300/70B01J35/613B01J35/635B01J35/633B01J2523/13B01J2523/68B01J2523/22B01J2523/11B01J2523/23
Inventor 展学成钱颖孙利民郑云弟胡晓丽马好文王斌梁顺琴潘曦竹李平智谢培思
Owner PETROCHINA CO LTD
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