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Solvent dewaxing method

A dewaxing and solvent technology, applied in the recovery/refining of mineral wax, petroleum industry, etc., can solve the problem of high oil content in wax paste

Active Publication Date: 2005-08-03
CHINA PETROLEUM & CHEM CORP +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

But in this method, the oil content of the wax paste is still very high after adding additives, which is far from the oil content requirements of wax products.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0017] The raw material oil is deasphalted oil refined by furfural. The properties of the raw material are shown in Table 1. The dewaxing solvent is a mixed solvent of butanone and toluene (volume ratio 50:50).

[0018] The specific process is briefly described as follows: first heat the feed oil to 85°C, then add 1500ppm dewaxing aid (a mixture of polyalpha-olefin and polyethylene, the number of carbon atoms of the polyalpha-olefin monomer is 12) to the hot feedstock oil -35, the molecular weight distribution is 3000-2500000, the molecular weight distribution of polyethylene is 600-100000, the weight ratio of the former to the latter is 3:2), each dilution solvent is added successively under stirring, and two-stage low-temperature filtration is adopted, the second The filtrate of the second stage is all recycled to the first stage as the three dilution solvents for the first stage dewaxing. The first-stage filtration temperature is -17°C, and the second-stage filtration tempe...

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Abstract

During solvent dewaxing, the mixture of wax containing material oil, dewaxing solvent and dewaxing assistant is made to pass through two stages of dewaxing material oil and deoiling cerate; the filtrate from the deoiling stage is returned to the dewaxing stage completely; and dewaxed oil and deoiled wax are obtained after recovering the solvent. The dewaxing assistant is ashless polymer mixture of high branched chain degree polymer and low branched chain degree polymer. The method improves the crystal structure of wax, raises oil-wax separating effect, raises dewaxed oil yield and filtering speed obviously, lowers the solvent ratio and lowers the oil content in cerate. The cerate may be used in producing paraffin or microcrystal wax.

Description

technical field [0001] The invention belongs to a hydrocarbon oil solvent dewaxing method. More specifically, the present invention is a process for solvent dewaxing of hydrocarbon oils using filter aids. Background technique [0002] The solvent dewaxing process is an important process in the lubricating oil production process. There are two processes in the industry: solvent dewaxing and solvent dewaxing and deoiling. These two processes are used in solvent dewaxing units and solvent dewaxing and deoiling combined units respectively. , The solvent dewaxing process is used to obtain dewaxed oil, and the solvent dewaxing and deoiling process is used to obtain dewaxed oil and wax products. The solvent dewaxing process is briefly described as follows: add diluent solvent to the lubricating oil raw material in stages to reduce the viscosity of the raw material oil, while stirring, cooling and crystallizing to the required dewaxing temperature, the mix...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C10G73/22
Inventor 杨文中丁洛王玉章陈国成
Owner CHINA PETROLEUM & CHEM CORP
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