A kind of method of heavy oil pretreatment

A pretreatment and heavy oil technology, which is applied in the direction of multi-stage series refining process treatment, can solve the problems of low separation efficiency, increase equipment investment and energy consumption, and achieve the purpose of improving separation speed and efficiency, increasing yield, reducing The effect of small impact

Active Publication Date: 2020-11-06
CHINA PETROLEUM & CHEM CORP +1
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Problems solved by technology

However, this method needs to add a large amount of light solvent for dilution, and the vis-reduced residue is still in a relatively stable phase equilibrium, and the separation efficiency is low. To achieve a high separation rate, multiple stages must be connected in series, which increases equipment investment and energy. consumption

Method used

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  • A kind of method of heavy oil pretreatment

Examples

Experimental program
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Effect test

Embodiment 1

[0028] This example is an implementation of the pretreatment method for the vacuum residue raw material. The vacuum residue raw material enters the visbreaking unit for visbreaking. After moderate visbreaking, a visbroken residue is obtained. Add a composite modifier to the visbreaking residue, which is made of polyacrylamide (CPAM), polyaluminum chloride (PAC), 2,6-di-tert-butyl-4-methylphenol ( BHT) and N,N'-disalicylidene propylenediamine, the weight ratio is 20:40:60:1, and the addition amount of the composite modifier is 0.05% of the weight of the vacuum residue raw material. The mixture enters a continuous settling device for continuous settling, and the operating conditions are as follows: the temperature is 80° C., and the operating pressure is the pressure at which the composite modifier is kept in a liquid phase at the operating temperature. The overflow material is obtained at the overflow outlet of the continuous settling device, and the volume yield of the overf...

Embodiment 2

[0032] Same as Example 1, except adding polyacrylamide (CPAM), polyaluminum chloride (PAC), 2,6-di-tert-butyl-4-methylphenol (BHT) and N, N'-disalicylidene Propylenediamine is mixed in a weight ratio of 30:60:60:1. Wherein, the volume yield of the overflow material obtained is 68%, and the properties of the overflow material are shown in Table 4.

Embodiment 3

[0034] Same as Example 1, except adding polyacrylamide (CPAM), polyaluminum chloride (PAC), 2,6-di-tert-butyl-4-methylphenol (BHT) and N, N'-disalicylidene The weight ratio of propylenediamine mixed is 20:40:80:2. Wherein, the resulting overflow material volume yield is 72%.

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Abstract

The invention discloses a method for pre-treating heavy oil. The method comprises that a) a heavy oil raw material enters a visbreaking device, and is subjected to visbreaking to obtain visbreaking residue oil; and b) a composite modifier is added to the visbreaking residue oil obtained in the step a), and the obtained mixture is subjected to continuous settling, such that an overflow material isobtained from the upper portion, and an underflow material is obtained from the lower portion, wherein the composite modifier comprises polyacrylamide, polyaluminum chloride, 2,6-di-tert-butyl-4-methylphenol and N,N'-bissalicylidene propanediamine according to a weight ratio of (10-40):(30-70):(10-100):(0.5-3), and the composite modifier accounts for 0.01-0.2% of the weight of the heavy oil raw material in the step a). According to the present invention, the method has advantages of low operation cost, high separation efficiency and the like, and can improve the yield of the overflow componentand easily weaken the influence on the activity stability of the catalyst in the subsequent fixed bed hydrotreating process.

Description

technical field [0001] The invention relates to a method for pretreatment of heavy oil, in particular to a method for pretreatment of low-quality heavy oil before fixed-bed hydrotreating. Background technique [0002] Crude oil resources around the world are gradually becoming heavy and inferior. It is estimated that heavy crude oil reserves will account for about 50% of the global recoverable crude oil reserves after 2020. Efficient processing and utilization of heavy oil is a major challenge for the refining industry. According to the different processes, the existing heavy oil processing processes in the world can be classified into three categories: (1) Processes preceded by coking process; (2) Processes preceded by solvent deasphalting; (3) Processes preceded by hydrogenation Process as the lead flow. [0003] The coking process is the most thorough decarbonization process, and it is also the technology that can directly process all low-quality heavy oils. However, the...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C10G53/02
Inventor 杨旭耿新国刘铁斌翁延博李洪广袁胜华
Owner CHINA PETROLEUM & CHEM CORP
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