Solvent dewaxing method of low-wax content hydrocarbon oil

A dewaxing solvent and dewaxing technology, 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: 2013-03-06
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 solven

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 methyl ethyl ketone-toluene mixed solvent, and the volume content of methyl ethyl ketone is 65%. The multi-point dilution process is adopted, and the dewaxing is performed in three casing crystallizers. Crystallization at medium cooling, and the total dewaxing agent oil ratio is 3:1. After the dewaxing wax paste is heated at 60°C to melt, the primary dilution solvent is added, the temperature is lowered and crystallized in the first deoiling casing crystallizer, and then the secondary deoiling dilution solvent is added, and then it enters the second deoiling casing crystallizer to crystallize. The deoiling solvent is the same as the dewaxing solvent, the primary and secondary deoiling solvent ratios are 1:1 and 1:1, respectively, and the total deoiling agent oil ratio is 2:1 (relative ...

Embodiment 2

[0044] The raw material oil is minus four-line furfural extract oil, 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 methyl ethyl ketone-toluene mixed solvent, and the volume content of methyl ethyl ketone is 75%. The multi-point dilution process is adopted. The dewaxing is performed in three casing crystallizers. Crystallization at medium cooling, the total dewaxing agent oil ratio is 2:1. After the dewaxing wax paste is heated at 75°C and melted, the primary dilution solvent is added, the temperature is lowered and crystallized in the first deoiling casing crystallizer, and then the secondary deoiling dilution solvent is added, and then it enters the second deoiling casing crystallizer for crystallization. The deoiling solvent is the same as the dewaxing solvent, the primary and secondary deoiling solvent ratios are 0.2:1 and 0.2:1, respectively, and the total deoiling agent oil ratio is 0.4:1 (relative to ...

Embodiment 3

[0049] The raw material oil is refined and extracted oil with light solvent removal, 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 methyl ethyl ketone-toluene mixed solvent, and the volume content of methyl ethyl ketone is 50%. The multi-point dilution process is adopted. The dewaxing is carried out in three casing crystallizers. Crystallization at medium cooling, with a total agent-to-oil ratio of 5.5:1. After the dewaxing wax paste is heated at 90°C to melt, the primary dilution solvent is added, the temperature is lowered and crystallized in the first deoiling casing crystallizer, and then the secondary deoiling dilution solvent is added, and then it enters the second deoiling casing crystallizer for crystallization. The deoiling solvent is the same as the dewaxing solvent, the primary and secondary deoiling solvent ratios are 0.8:1 and 1:1 respectively, and the total deoiling agent oil ratio is 1.8:1 (re...

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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. Specifically, the present invention relates to a solvent dewaxing method for low wax hydrocarbon oil. 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 process of the lubricating base oil to reduce the freezing point or pour point of the lubricating base oil. In the industry, petroleum distillate and light deoiled wax products are called petroleum wax. Petroleum wax is divided into paraffin wax and microcrystalline wax. Paraffin waxes are mainly normal paraffins and a certain amount of isoparaffins, which are generally produced by dewaxing and deoiling distillate; microcrystalline waxes contain normal paraffins, isoparaffins and alkyl cyclic hydrocarbons, and contain a certain amount of paraffins. Alkyl aromatic hydrocarbons are generally produced from deasphalted oil ...

Claims

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Application Information

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