Solvent dewaxing method of low-wax content hydrocarbon oil

A dewaxing solvent and dewaxing technology, which is applied in the field of hydrocarbon oil dewaxing, can solve the problems of difficult removal, achieve the effect of increasing the frequency of warm washing, increasing the filtration speed, and reducing the temperature difference of dewaxing

Active Publication Date: 2014-12-31
CHINA PETROLEUM & CHEM CORP +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, it is very difficult to remove the wax from the solvent refined extracted oil by conventional solvent dewaxing process

Method used

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  • Solvent dewaxing method of low-wax content hydrocarbon oil
  • Solvent dewaxing method of low-wax content hydrocarbon oil

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0039] The raw material oil is refined oil with reduced second-line furfural, and its properties are shown in Table 1. The mass ratio of dewaxing aid to raw oil is 0.02:1, the dewaxing solvent is butanone-toluene mixed solvent, the volume content of butanone is 65%, and the multi-point dilution process is adopted, and the dewaxing is carried out in three casing crystallizers Crystallization at moderate cooling, dewaxing with a total agent-to-oil ratio of 3:1. The dewaxing wax paste is heated to 60°C to melt, and then a diluting solvent is added, cooled and crystallized in the first deoiling sleeve crystallizer, and then the second deoiling diluting solvent is added, and then enters the second deoiling sleeve crystallizer for crystallization. The deoiling solvent is the same as the dewaxing solvent, the primary and secondary solvent ratios for deoiling are 1:1 and 1:1 respectively, and the total agent-oil ratio for deoiling is 2:1 (relative to the raw material oil). Attached ...

Embodiment 2

[0044] The raw material oil is extracted oil with four-line furfural reduction, and its properties are shown in Table 1. The mass ratio of dewaxing aid to raw oil is 0.03:1, the dewaxing solvent is butanone-toluene mixed solvent, the volume content of butanone is 75%, and the multi-point dilution process is adopted, and the dewaxing is carried out in three casing crystallizers Crystallization at moderate cooling, dewaxing with a total agent-to-oil ratio of 2:1. The dewaxing wax paste is heated to 75°C to melt, then a diluting solvent is added, cooled and crystallized in the first deoiling sleeve crystallizer, and then the second deoiling diluting solvent is added, and then enters the second deoiling sleeve crystallizer for crystallization. The deoiling solvent is the same as the dewaxing solvent, the primary and secondary solvent ratios for deoiling are 0.2:1 and 0.2:1 respectively, and the total agent-oil ratio for deoiling is 0.4:1 (relative to the raw material oil). Attach...

Embodiment 3

[0049] The raw oil is lightly desolvated and refined extracted oil, and its properties are shown in Table 1. The mass ratio of dewaxing aid to raw oil is 0.1:1, the dewaxing solvent is butanone-toluene mixed solvent, the volume content of butanone is 50%, and the multi-point dilution process is adopted, and the dewaxing is carried out in three casing crystallizers Crystallization at moderate cooling, the total agent-to-oil ratio is 5.5:1. The dewaxing wax paste is heated to 90°C to melt, and then a diluting solvent is added, cooled and crystallized in the first deoiling sleeve crystallizer, and then the second deoiling diluting solvent is added, and then enters the second deoiling sleeve crystallizer for crystallization. The deoiling solvent is the same as the dewaxing solvent, the ratios of primary and secondary solvents for deoiling are 0.8:1 and 1:1 respectively, and the total agent-oil ratio for deoiling is 1.8:1 (relative to the raw material oil). Attached figure 1 The ...

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Abstract

The invention relates to a solvent dewaxing method of low-wax content hydrocarbon oil. The solvent dewaxing method comprises the following steps of mixing one or more raw material oil, one or more dewaxing assistants and dewaxing solvents, cooling to a filtration temperature, filtering to obtain a dewaxed solution and dewaxed cerate, removing the solvents in a dewaxed filtrate to obtain dewaxed oil, heating the dewaxed cerate until dissolution, cooling for crystallization, before dewaxed cerate heating dissolution and / or after dewaxed cerate heating dissolution, adding a deoiling solvent into the crystallized dewaxed cerate, cooling to a deoiling filtration temperature, and filtering to obtain a deoiled filtrate and deoiled cerate, wherein C17-C100 n-alkane mass content of the one or more dewaxing assistants is greater than or equal to 40% and a mass ratio of the one or more dewaxing assistants to the one or more raw material oil is in a range of (0.01: 1) to (0.3: 1). Compared with the conventional solvent dewaxing technology, the solvent dewaxing method provided by the invention can effectively remove wax in low-wax content hydrocarbon oil, reduce a dewaxing temperature difference and improve a filtration speed.

Description

technical field [0001] The invention belongs to a method for dewaxing hydrocarbon oil. In particular, the present invention relates to a process for solvent dewaxing of low waxy hydrocarbon oils. Background technique [0002] In order to maintain the low-temperature fluidity of the lubricating oil, the wax contained in the raw oil must be removed during the production of the lubricating base oil to lower the freezing point or pour point of the lubricating base oil. Industrially, the wax products produced by dewaxing and deoiling petroleum fractions and light deoiling are called petroleum waxes. Petroleum wax is divided into paraffin wax and microcrystalline wax. Paraffin wax is mainly composed of normal alkanes and a certain amount of isoparaffins, which are generally produced by dewaxing and deoiling of distillate oil; microcrystalline waxes contain normal alkanes, isoparaffins and alkyl ring hydrocarbons, and contain a certain amount of alkanes Aromatic hydrocarbons are...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C10G53/04C10G73/22
Inventor 王玉章丁洛管翠诗
Owner CHINA PETROLEUM & CHEM CORP
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