Whole-fraction crude benzene hydrogenation method and catalyst

A technology of whole fractions and catalysts, applied in the fields of hydrocarbons, chemical instruments and methods, organic chemistry, etc., can solve the problems of environmental hidden dangers, unable to fundamentally solve the problems of crude benzene coking, high sulfur and nitrogen content, etc.

Inactive Publication Date: 2014-09-03
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 ...

Method used

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  • Whole-fraction crude benzene hydrogenation method and catalyst
  • Whole-fraction crude benzene hydrogenation method and catalyst
  • Whole-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. The physical and chemical properties of a crude benzene low-temperature hydrogenation catalyst, crude benzene pre-hydr...

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Abstract

The invention discloses a whole-fraction crude benzene hydrogenation method and a catalyst, and belongs to the technical field of whole-fraction crude benzene processing. According to the whole-fraction crude benzene hydrogenation method, firstly crude benzene fraction at the temperature being higher than or equal to 70 DEG C and hydrogen sequentially pass through a micro-particle generator and a static mixer, the two raw materials are mixed to form uniform micro particles with the diameter of 0.1-20 microns, and the micro-particle-state raw material is hydrogenated to be sufficiently saturated in the presence of a low-temperature hydrogenation catalyst and under the conditions of the certain pressure, air speed and temperature so that the raw material is converted into a stable saturated compound; low-temperature hydrogenated oil is mixed with new hydrogen, recycle hydrogen and crude benzene fraction coming from a pre-fractionating tower and having a temperature being lower than 70 DEG C, and then the mixture is hydrogenated; the hydrogenated whole-fraction crude benzene generated oil is subjected to gas stripping and fractional distillation to obtain light arene fraction and heavy arene products; and finally a separation flow comprising pre-distillation, extraction and rectification is carried out to obtain purified petroleum benzene, methylbenzene and non-arene products. By virtue of the whole-fraction crude benzene hydrogenation method and the catalyst, the problem of coking in a process of high-temperature hydrogenation of whole-fraction crude benzene raw materials is solved, and the long-term circulation of the crude benzene hydrogenation device is realized.

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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IPC IPC(8): C07C7/163C07C15/04C07C15/06C07C15/08B01J23/89B01J23/883B01J23/882B01J23/887B01J23/885
CPCY02P20/52
Inventor 曹雪阳
Owner XUZHOU LONGHUI CHEM TECH
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