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Method for hydrofining paraffin wax

A hydrofining and paraffin wax technology, which is applied in petroleum wax refining and other directions, can solve the problems of reducing the processing capacity of the device, increasing the production cost, and not being able to meet the product requirements for aromatics content, and achieve the effect of simple process and low energy consumption

Active Publication Date: 2013-04-10
CHINA PETROLEUM & CHEM CORP +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

When processing low-quality petroleum waxes with high aromatics content, the aromatics saturation activity of sulfurized W-Ni catalysts usually cannot meet the requirements. If the aromatics content meets the requirements, it is necessary to improve the operation of the W-Ni catalyst bed. Severity, such as increasing the reaction pressure and reducing the space velocity, but this will reduce the processing capacity of the device, increase the production cost, shorten the service life of the catalyst, and even change the basic properties of the wax. Even so, sometimes it cannot be used Aromatic content meets product requirements

Method used

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  • Method for hydrofining paraffin wax

Examples

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Effect test

Embodiment 1

[0025] The No. 58 wax of Daqing crude oil containing 0.40wt% oil was treated by hydrogenation process. In the first reactor, catalyst A was hydrogenated with paraffin wax, and vulcanized by the following method; in the second reactor, nickel catalyst B was used for reduction by the following method.

[0026] The sulfidation process of the hydrorefining catalyst A is to use kerosene containing 2wt% carbon disulfide under a pressure of 6 MPa, at a constant temperature of 250° C. for 10 hours, and at a constant temperature of 300° C. for 8 hours. Reduction of Nickel Catalyst B The reduction process was treated with hydrogen at 300° C. for 20 hours under a pressure of 2 MPa.

[0027] After the catalyst was sulfided and reduced, the process conditions were adjusted to carry out the paraffin hydrogenation process. The process conditions and product properties used are shown in Table 2. The obtained paraffin products meet the national standards for food paraffin.

Embodiment 2

[0029] The raw wax processed in this embodiment is No. 66 crude paraffin wax containing 0.46w% oil. The process conditions used are shown in Table 2, and all the other are the same as in Example 1. The properties of the product obtained are shown in Table 2.

Embodiment 3

[0031] The raw wax processed in this embodiment is No. 70 crude paraffin wax containing 0.45w% oil. The process conditions used are shown in Table 2, and all the other are the same as in Example 1. The properties of the product obtained are shown in Table 2.

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Abstract

The invention discloses a method for hydrofining paraffin wax. The method comprises the following steps that: a paraffin wax raw material and hydrogen are mixed and delivered into a first reactor to contact a vulcanized non-precious metal hydrofining catalyst to undergo hydrogenation; and the effluent of the first reactor is subjected to gas-liquid separation, an obtain liquid phase and hydrogen are mixed and delivered to a second reactor using a reducing catalyst, and the effluent of the second reactor is subjected to gas-liquid separation to obtain the paraffin wax product. The method has high raw material adaptability and is particularly suitable for processing low-quality and heavy-fraction paraffin wax raw material. The method integrates the requirements on paraffin wax hydrofining and the characteristic that the sulfur and aromatic hydrocarbon content of the low-quality paraffin wax is high, optimizes a process flow, operation conditions and a catalyst and ensures the produced paraffin wax products meet the requirements of Standards for Food Grade Paraffin Wax of the People's Republic of China.

Description

technical field [0001] The invention relates to a method for hydrofinishing of paraffin, in particular to a method for hydrofining of inferior paraffin. Background technique [0002] Paraffin wax is a solid petroleum product obtained by solvent dewaxing and deoiling of vacuum distillate oil. It is an important raw material for medicine, daily chemical industry and other fine chemical industries. Paraffin wax for these purposes needs to be deeply refined to remove sulfur, nitrogen compounds and condensed aromatic hydrocarbons contained therein, in order to be harmless to the human body. [0003] At present, paraffin refining includes white clay refining and hydrofining, among which white clay refining technology is to use white clay to adsorb and remove non-ideal components; A process in which non-ideal components are hydroconverted. Compared with white clay refining, hydrofining has the characteristics of high product yield, good quality, and no waste residue, and has beco...

Claims

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Application Information

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IPC IPC(8): C10G73/44
Inventor 李殿昭刘平蔡立袁平飞王士新
Owner CHINA PETROLEUM & CHEM CORP