Apparatus and method for recovering solvent in granulation of de-oiled asphalt with high softening point
A deoiled asphalt, high softening point technology, applied in the processing of tar asphalt/petroleum asphalt/natural asphalt, curing/crushing processing tar asphalt/petroleum asphalt/natural asphalt, petroleum industry, etc., to ensure smooth operation and simple equipment , the effect of short process
Inactive Publication Date: 2013-05-15
CHINA PETROLEUM & CHEM CORP +1
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[0006] Aiming at the deficiencies of the prior art, the present invention provides a method and device for recovering solvent from high-softening point deoiled asphalt granulation. The process of the method is simple, and at the same time, it solves the problems of high-efficiency recovery of high-softened deoiled asphalt solvent and stable operation of the device
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[0024] Taking butane solvent deasphalting as an example, a packed solvent deasphalting tower is used, the temperature of the tower, the tower, and the lower tower are 160°C, 153°C, and 145°C in sequence, and the residual oil is the vacuum residue of Saudi medium crude oil > 550°C Oil, agent oil volume ratio 4.5 / 1. The softening point of deoiled asphalt is 175°C when the amount of deasphalted oil extracted reaches 70%. This high softening point deoiled asphalt carries part of the solvent from the bottom of the tower into the screw rod to push the extrusion mechanical system. After extruding and granulating in the deoiled asphalt solvent separation chamber, the deoiled asphalt particles fall into the granules at a temperature of 25 through the slideway. The butane solvent gas (butane boiling point -0.522°C) collected in the deoiled asphalt solvent enrichment chamber will be liquefied by the solvent recovery system and continue to be used.
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Abstract
The invention relates to an apparatus and a method for recovering a solvent in granulation of de-oiled asphalt with a high softening point. Specifically speaking, the de-oiled asphalt with a high softening point discharged from the bottom of a solvent deasphalting tower is granulated through a screw extrusion system, and obtained granular de-oiled asphalt is directly introduced into a de-oiled asphalt solvent enrichment chamber; and the top of the solvent enrichment chamber is provided with a solvent gas recovery pipeline communicated with a solvent recovery system, and facilities like a de-oiled asphalt solid particle water entering slideway are arranged in the chamber so as to prevent the de-oiled asphalt from directly falling into cooling water and prolonging time for releasing of the solvent by the granular de-oiled asphalt. Compared to the prior art, the method for recovering the solvent in granulation of the de-oiled asphalt with a high softening point has the following advantages: the whole process is simple and easily practicable, equipment like a heating furnace and a stripping tower in a conventional de-oiled asphalt solvent separation unit are omitted, and the phenomena of high energy consumption, long flow process and instable operation in recovery of the solvent used for the de-oiled asphalt with a high softening point are avoided.
Description
technical field [0001] The invention relates to a device and method for recovering solvent from deoiled asphalt granulation in a solvent deasphalting process, in particular to a device and method for recovering solvent from high softening point deoiled asphalt material. Background technique [0002] In the oil refining industry, the solvent deasphalting process is mainly based on the principle of similar miscibility, sending alkane solvents and heavy fractions such as residual oil into the solvent extraction (extraction) tower, and using solvents to selectively remove distillates from residual oil and other distillates. Dissolve and extract the lighter fraction rich in alkanes to form a deasphalted oil solution, and flow into the deasphalted oil solvent separation unit from the top of the tower, separate the solvent into the solvent recovery system for reuse, and obtain deasphalted oil (DAO) at the same time as Lubricant base oil, raw material for catalytic cracking and hydr...
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IPC IPC(8): C10C3/16C10C3/00
Inventor 宁爱民沈本贤高鲜会赵基钢李明林
Owner CHINA PETROLEUM & CHEM CORP
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