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Method for lowering pour point depression of crude oil and corresponding crude oil

A technology for pour point depressurization and crude oil, applied in the petroleum industry, cracking, non-catalytic thermal cracking, etc., can solve problems such as kinetic limitations and achieve cost-saving effects

Active Publication Date: 2018-03-27
EAST CHINA UNIV OF SCI & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The kinetics of the subsequent bimolecular hydrogen abstraction reaction of aliphatic carbon radicals to other aliphatic chains is also limited by high viscosity.

Method used

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  • Method for lowering pour point depression of crude oil and corresponding crude oil
  • Method for lowering pour point depression of crude oil and corresponding crude oil
  • Method for lowering pour point depression of crude oil and corresponding crude oil

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0063] The crude oil produced in Daqing, China, with high wax and high freezing point was used as the crude oil sample, and the pour point depressing treatment was carried out.

[0064] The basic properties of crude oil are shown in Table 1:

[0065] Table 1 Basic properties of Daqing crude oil

[0066]

[0067] The determination of the freezing point of crude oil and pour point depressant products is carried out according to the standard SY / T 0541-2009, the determination of the group composition is carried out according to the standard SY / T5119-2016, and the measurement of the wax content is carried out according to the standard SY / T 7550-2012.

[0068] The specific implementation steps are:

[0069] Add methanol and crude oil respectively in the reactor;

[0070] The amount of methanol added is 25% of the volume of the reactor, and the density of methanol under reaction conditions is controlled to be 0.25g / cm 3 , the mass ratio of methanol and crude oil at normal tempe...

Embodiment 2

[0082] Similarly, high-wax and high-condensation crude oil produced in Daqing, China was used as a crude oil sample for depressing treatment.

[0083] The basic properties of crude oil are shown in Table 1.

[0084] The determination of the freezing point, group composition and wax content of crude oil and pour point depressant products is based on the same standard as example 1.

[0085] The specific implementation steps are:

[0086] Add methanol and crude oil respectively in the reactor;

[0087] The amount of methanol added is 30% of the volume of the reactor, and the density of methanol under reaction conditions is controlled to be 0.30g / cm 3 , the mass ratio of methanol and crude oil at normal temperature is 4:1;

[0088] The reaction kettle was purged with high-purity nitrogen to replace the air and sealed, then the temperature was raised to 400℃ with a gradient of 15°C / min and the timing was started. After the set reaction time was reached, the heating was stopped i...

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Abstract

The invention relates to a method for lowering pour point depression of crude oil. The method comprises the following steps: conveying methanol with a supercritical state into a thermal cracking system of the crude oil and transferring thermal cracking of the crude oil to a pseudo-homogeneous structure from an oil phase; controlling a thermal cracking trend of the crude oil by reaction kinetics, so as to accelerate alkyl breaking of C18 to C30 mixed alkane in the crude oil at low temperature, inhibit condensation reaction in the thermal cracking and realize perpetual reduction of the pour point of the crude oil. The invention further provides the crude oil. By adopting the method for lowering the pour point depression of the crude oil and the corresponding crude oil, provided by the invention, shallow thermal cracking is carried out on the crude oil in a supercritical methanol solvent and corresponding alkane components corresponding to wax are selectively cracked, so that the pour point depression of the crude oil is perpetually lowered, and the pipeline transportation cost and the subsequent processing treatment cost of the crude oil are saved; the condensation reaction is inhibited so that group composition distribution of the crude oil basically keeps unchanged.

Description

technical field [0001] The invention relates to the technical field of crude oil, in particular to a crude oil pour point depressing method, in particular to a method for crude oil pour point depressing and corresponding crude oil. Background technique [0002] C 18 ~C 30 The mixture of straight-chain alkanes, branched-chain alkanes and monocyclic naphthenes with long side chains is called paraffin, also known as "C 18 ~C 30 Mixed alkanes". The solubility of wax in crude oil decreases with the decrease of temperature. Under certain temperature conditions, wax crystals precipitate and form a three-dimensional network structure in crude oil, so that crude oil loses fluidity. The temperature at this time is called crude oil The freezing point of the crude oil. Most of the crude oil in our country is high waxy and high freezing point crude oil, which brings difficulties to oil exploitation or pipeline transportation. Changing the fluidity of crude oil, that is, reducing the f...

Claims

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Application Information

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IPC IPC(8): C10G9/00
CPCC10G9/00
Inventor 袁佩青李艳陈勇屈昊刘军
Owner EAST CHINA UNIV OF SCI & TECH
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