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Heavy oil supercritical extraction separation method and device

A supercritical and heavy oil technology, applied in the treatment of hydrocarbon oil, petroleum industry, refined hydrocarbon oil, etc., can solve problems such as equipment blockage, affecting device online rate and reliability, etc., and achieve reduced consumption, good fluidity and mass transfer performance , Reduce the effect of heat transfer area

Pending Publication Date: 2022-05-03
CHINA PETROLEUM & CHEM CORP +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Deoiled asphalt with high viscosity and high softening point is more likely to cause equipment blockage under the subcritical conditions of traditional solvent deasphalting technology, which affects the online rate and reliability of the device

Method used

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  • Heavy oil supercritical extraction separation method and device
  • Heavy oil supercritical extraction separation method and device
  • Heavy oil supercritical extraction separation method and device

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0092] Embodiment 1 illustrates the effect of the heavy oil supercritical extraction separation method provided by the present invention.

[0093] The residual oil raw material is Middle East reduced residue (50wt% each of Saudi medium reduced residue and Saudi heavy reduced residue), and its properties are shown in Table 1.

[0094] The extraction solvent is commercially available n-butane (chemically pure, purity>99%).

[0095] use as figure 1 The heavy oil supercritical extraction and separation process shown is used for extraction and separation.

[0096] Wherein, the packing filled between the upper distributor in the extraction tower and the top of the tower is a plate corrugated packing without openings. There is no filler installed between the upper distributor and the lower distributor.

[0097] The temperature of the residual oil raw material is 150°C, and the temperature of the residual oil raw material after passing through the raw material heater is 170°C. The...

Embodiment 2

[0109] Embodiment 2 illustrates the effect of the heavy oil supercritical extraction separation method provided by the present invention.

[0110] Residuum raw material, heavy oil supercritical extraction separation device and process are the same as in Example 1. The extraction solvent is n-pentane. The critical temperature of n-pentane is 196.6°C and the critical pressure is 3.37MPa.

[0111] The temperature of the residual oil raw material is 150°C, and the temperature of the residual oil raw material after passing through the raw material heater is 230°C.

[0112] The operating conditions of the extraction tower are 11-14MPa, 210-230°C; the operating conditions of the solvent recovery tower are 4-4.5MPa, 210°C.

[0113] The weight ratio of the total extraction solvent entering the extraction tower and the residual oil raw material is 1.6:1;

[0114] After being treated by the above method, the obtained deasphalted oil and deoiled asphalt products are shown in Table 2. ...

Embodiment 3

[0116] Embodiment 3 illustrates the effect of the heavy oil supercritical extraction separation method provided by the present invention.

[0117] Residuum raw material, heavy oil supercritical extraction separation device and process are the same as in Example 1. The extraction solvent is a mixed solvent of n-butane and n-pentane (50% by mole fraction). The pseudocritical temperature of the mixed solvent is 174.3°C, and the pseudocritical pressure is 3.58MPa ( T C is the pseudocritical temperature, P C is the false critical pressure, x i is the mole fraction of each component, T c,i ,P c,i are the critical temperature and critical pressure of the i solvent, respectively).

[0118] The temperature of the residual oil raw material is 150°C, and the temperature of the residual oil raw material after passing through the raw material heater is 230°C.

[0119] The operating conditions of the extraction tower are 9-11MPa, 190-200°C; the operating conditions of the solvent re...

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Abstract

The invention relates to a heavy oil supercritical extraction separation method and device, and the method comprises the following steps: a heavy oil raw material is sent to an extraction tower and is in countercurrent contact with an extraction solvent in a supercritical state for supercritical extraction, a deasphalted oil solution flows out from the tower top, and a deoiled asphalt solution flows out from the tower bottom; the deasphalted oil solution directly enters a solvent recovery tower and is separated from the deasphalted oil in a supercritical state after pressure reduction, and the separated extraction solvent flows out from the tower top, is pressurized to extraction pressure and is sent to the middle lower part of the extraction tower for recycling; and deasphalted oil containing a small amount of extraction solvent flows out from the tower bottom. According to the method provided by the invention, the operating temperatures of the extraction tower and the solvent recovery tower are close, and the material at the top of the extraction tower enters the solvent recovery tower without heat exchange for solvent recovery, so that the energy consumption of the device is obviously reduced.

Description

technical field [0001] The invention belongs to the field of petrochemical technology, and relates to a method and a device for selective solvent extraction, and more specifically, to a method and a device for separating heavy oil under supercritical conditions. Background technique [0002] Crude oil processed by refineries around the world is becoming more and more heavy and inferior, which has become the "new normal". Among the crude oil processed in China, fractions above 350°C account for more than 55% of the total fraction of crude oil. The choice of heavy oil processing technology routes for refineries increasingly become the key to determining its profitability. Solvent deasphalting process is one of the effective methods to improve the processing depth of vacuum residue and increase the added value of heavy oil. It is a process of removing asphaltenes and condensed ring compounds that are difficult to convert in vacuum residue oil, as well as heavy metals, sulfur a...

Claims

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Application Information

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IPC IPC(8): C10G21/00C10G21/14C10G21/28C10G21/30C10G53/04
CPCC10G21/00C10G21/14C10G21/28C10G21/30C10G53/04C10G2300/4006C10G2300/4012C10G2300/44C10G2300/206
Inventor 廖志新王翠红佘玉成王红
Owner CHINA PETROLEUM & CHEM CORP
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