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Full fraction crude benzene hydrogenation method and catalyst

A full fraction, catalyst technology, applied in physical/chemical process catalysts, metal/metal oxide/metal hydroxide catalysts, hydrocarbons, etc., can solve the problem of high sulfur and nitrogen content, inability to add value to crude benzene, and environmental hidden dangers And other issues

Active Publication Date: 2014-07-09
XUZHOU LONGHUI CHEM TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Although this approach can effectively avoid the coking problem of the device, the remaining heavy components in crude benzene cannot add value, and because of its high sulfur and nitrogen content, there are environmental hazards;
[0009] In addition, such as ZL201110147149.9, ZL200610136857.1, etc. can use the whole distillate crude benzene as raw material, but the process can only delay the coking speed of the crude benzene hydrogenation process, but cannot fundamentally solve the problem of crude benzene coking

Method used

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  • Full fraction crude benzene hydrogenation method and catalyst
  • Full fraction crude benzene hydrogenation method and catalyst
  • Full fraction crude benzene hydrogenation method and catalyst

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preparation example Construction

[0084] The preparation method of described low-temperature hydrogenation catalyst is characterized in that:

[0085] ⑴The carrier is first impregnated with metal Pd or Pt-containing soluble salts and Mg-containing soluble salts in turn, and then dried and roasted to obtain metal Pd or Pt, Mg-containing carriers; then metal-containing Pd or Pt, Mg-containing carriers Co-impregnation of Ni-containing soluble salts, followed by drying, calcination and reduction processes to obtain finished catalysts;

[0086] (2) In the above preparation method, the drying and roasting conditions after impregnating the soluble salt containing metal Pd or Pt, and the soluble salt containing Mg are as follows: drying temperature is 120-150°C, drying time is 12-24h; roasting temperature is 500-600°C ℃, the roasting time is 12~24h;

[0087] (3) In the above preparation method, the drying and roasting conditions after co-impregnation of Ni-containing soluble salts are as follows: drying temperature i...

Embodiment 1

[0112] A low-temperature hydrogenation catalyst for crude benzene, the preparation method of which is as follows: a MAl with a spinel structure prepared by roasting at a temperature of 900°C 2 o 3 Mixed oxides are used as the carrier. First, the carrier is placed in a container containing a mixed solution of palladium nitrate and magnesium nitrate for mixing and impregnation for 24 hours, and the impregnated product is dried at 120°C for 12 hours, and then placed in a roasting furnace Roast at 500°C for 12 hours; then place the dried and roasted product in a solution containing nickel nitrate and immerse it for 48 hours, dry the impregnated product at 120°C for 12 hours, and then place it in a roaster Roasting at 500°C for 12 hours; the obtained product is finished after being kept at a constant temperature of 400°C for 20 hours in a hydrogen atmosphere.

[0113] The physical and chemical properties of a crude benzene low-temperature hydrogenation catalyst, crude benzene pre-...

Embodiment 2

[0125] A low-temperature hydrogenation catalyst for crude benzene, the preparation method of which is as follows: a MAl with a spinel structure prepared by roasting at a temperature of 1100° C. 2 o 3 The mixed oxide is used as the carrier. First, the carrier is placed in a container containing a mixed solution of palladium nitrate and magnesium nitrate for mixing and impregnation for 24 hours, and the impregnated product is dried at 135°C for 18 hours, and then placed in a roasting furnace Roast at 550°C for 18 hours; then place the dried and roasted product in a solution containing nickel nitrate and immerse it for 48 hours, dry the impregnated product at 135°C for 18 hours, and then place it in a roaster Roasting at 550°C for 18 hours; the obtained product is finished after being kept at a constant temperature of 450°C for 30 hours in a hydrogen atmosphere.

[0126] The physical and chemical properties of a crude benzene low-temperature hydrogenation catalyst, crude benzene...

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Abstract

The invention discloses a full fraction crude benzene hydrogenation method and a catalyst, belonging to the technical field of all fraction crude benzene processing. The method comprises steps of firstly allowing crude benzene fraction over 70DEG C and hydrogen to pass through a corpuscule generator and a static mixer sequentially, so as to mix the two raw materials into uniform corpuscule raw material with diameter of 0.1-20mu m; fully saturating the corpuscule raw material through hydrogenation through the catalytic action of the low temperature hydrogenation catalyst under the conditions of certain pressure, air speed and temperature, so as to convert the corpuscule raw material into stable saturated compound; mixing the oil generated through low temperature hydrogenation with fresh hydrogen, circulating hydrogen and less than 70DEG C crude benzene fraction from a pre-fraction tower, then hydrogenating again, gas stripping and fraction distilling the oil generated by hydrogenating full fraction crude benzene so as to obtain light arene fraction and heavy arene product, then predistilling, extracting and rectifying so as to obtain pure benzene, methylbenzene, xylene and non-arene products. According to the method, the problem of coking of full fraction crude benzene raw material in high temperature hydrogenation is solved, and the crude benzene hydrogenation device can run for long period.

Description

technical field [0001] The invention relates to the effective utilization of crude benzene, a by-product of coal coking, and belongs to a method for realizing the processing of whole distillate crude benzene by an effective hydrogenation combined process. Background technique [0002] Crude benzene is a light distillate oil recovered from coal coking crude gas, and its yield is usually 0.9% to 1.3% of that charged into dry coal. Crude benzene is a complex mixture composed of various aromatic hydrocarbons and other compounds, of which benzene, toluene, and xylene content account for more than 85%. Through refining, important chemical products such as benzene, toluene, and xylene can be obtained. [0003] Crude benzene is mainly refined by pickling and hydrotreating. The pickling method has simple process flow, flexible operation and low equipment investment, but serious pollution, low product yield and poor quality. At present, this process has been eliminated due to environ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C07C7/163C07C15/04C07C15/06C07C15/08B01J23/89
CPCY02P20/52
Inventor 曹雪阳
Owner XUZHOU LONGHUI CHEM TECH
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