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Improved solvent-dewaxing method

A dewaxing and solvent technology, which is applied in the recovery/refining of mineral wax, petroleum industry, etc., can solve the problem of continuous deoiling of wax paste not involving oil, and achieve the effect of reducing oil content, improving yield and improving quality

Active Publication Date: 2006-11-22
CHINA PETROLEUM & CHEM CORP +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] CN1050737A discloses the method that is mixed as auxiliary agent by two kinds of polyacrylates, and a kind of is acrylic acid with C 10 -C 14 The other is a polymer formed by the polymerization of esters produced by alcohols, and the other is a polymer formed by the polymerization of esters produced by methacrylic acid and alcohols containing more than 10% branched chains. The mixing ratio of the two substances is 1:20-20 : 1, the addition is 0.01-1%, this method only relates to the solvent dewaxing part, does not relate to the continued deoiling of oily wax paste

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0022] The raw material oil is minus four-line hydrotreated oil, and the properties of the raw material are shown in Table 1. The dewaxing solvent is a mixed solvent of butanone and toluene, and the composition is butanone:toluene=60:40 (volume ratio), and one-stage dewaxing and two-stage dewaxing are adopted. Oil and multi-point dilution process, the total dilution ratio is 9:1, the specific process is briefly described as follows: first conduct a blank test, heat the raw material oil to 90°C, add pre-dilution, first dilution, second dilution, and third dilution solvents in sequence , and gradually lower the temperature to -20°C, filter to obtain dewaxing filtrate and oily wax paste, after the dewaxing filtrate is recovered, dewaxed oil is obtained, add the first stage of deoiling dilution solvent to the oily wax paste, filter after slurrying, Rinse to obtain a section of deoiling wax paste and a section of filtrate. After recovering the first section of deoiling filtrate, a s...

Embodiment 2

[0025] The light deasphalted oil refined by furfural is used as the experimental raw material. The properties of the raw material are shown in Table 1. The dewaxing solvent is a mixed solvent of butanone and toluene, and the composition is butanone:toluene=50:50 (volume ratio). Oil, the technique of multi-point dilution, the total dilution ratio is 10: 1, and the experimental process is basically the same as in Example 1, and the auxiliary agent addition is 1500ppm (relative feedstock oil weight), is composed of A (poly-alpha-olefin monomer carbon atoms The number distribution is: α-C 6 ~C 10 Olefins accounted for 10%, α-C 11 ~C 14 Olefins accounted for 20%, α-C 15 ~C 18 Olefins accounted for 35%, α-C 19-38 Olefin accounts for 35%, molecular weight distribution is 3000-2500000) accounts for 35% by weight, B (ethylene, propylene copolymer, molecular weight distribution is 3000-60000) accounts for 55% by weight, C (polyethylene glycol stearate, molecular weight distribution...

Embodiment 3

[0027] The third-line hydrotreated oil is used as the experimental raw material, and the properties of the raw material are shown in Table 1. The dewaxing solvent is a mixed solvent of methyl ethyl ketone and toluene, and the composition is methyl ethyl ketone:toluene=68:32 (volume ratio), and one-stage dewaxing and two-stage dewaxing are adopted. The technique of oil, multi-point dilution, and filtrate circulation, the total fresh dilution ratio is 4: 1, and the experimental process is basically the same as that of Example 1, and the auxiliary agent addition is 350ppm (relative to the raw material oil weight), and it is composed of A (polyα-olefin The distribution of monomer carbon atoms is: α-C 6 ~C 10 Olefins accounted for 15%, α-C 11 ~C 14 Olefins accounted for 20%, α-C 15 ~C 18 Olefins accounted for 50%, α-C 19-38Olefin accounts for 15%, molecular weight distribution is 3,000-1,500,000) accounts for 40% by weight, B (polyethylene, molecular weight distribution is 600...

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Abstract

The invention discloses an improved solvent dewaxing method, which is characterized by the following: adding ash-free macromolecular mixture with A) poly-alpha- olefin, B) polyethylene or ethane, propylene copolymer, C) alcohol polymer and derivant in the regular solvent dewaxing or solvent dewaxing de-oiling course; reducing oil content of dewaxing obviously to improve the quality of 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 a dewaxing aid. technical background [0002] The lubricating oil solvent dewaxing device is an important device for lubricating oil production in refineries. During production, the viscosity of the oil is reduced by adding a diluting solvent to the raw material of the lubricating oil, and gradually cooled to the required low temperature. The mixed slurry of oil and wax is passed through Separation by filtration and recovery to obtain dewaxed oil and oil-containing wax paste. If the oil-containing wax paste is not recovered, continue to dilute with a solvent and gradually increase the temperature. After filtration and separation, wax underoil and deoiled wax can be obtained after recovery. In the process of solvent dewaxing or solvent dewaxing and deoiling, the ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C10G73/22
Inventor 杨文中杨三庆丁洛王玉章曹谊华
Owner CHINA PETROLEUM & CHEM CORP
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