Process and equipment for negative pressure benzene removal

A debenzene and negative pressure technology, which is applied in the petroleum industry, combustible gas purification, combustible gas purification/reconstruction, etc., can solve the problems of high production consumption, low recovery rate, low quality, etc., and achieve the effect of reducing energy consumption

Active Publication Date: 2009-09-30
JINAN METALLURGICAL CHEM EQUIP CO LTD
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  • Abstract
  • Description
  • Claims
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AI Technical Summary

Problems solved by technology

[0005] In order to overcome the disadvantages of low quality of recovered products in the prior art, low recovery rate and high production consumption, the purpose of the present invention is to provide a method for negative pressure debenzene removal, and another purpose of the present invention is to provide suitable Equipment for negative pressure debenzene removal in this method

Method used

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  • Process and equipment for negative pressure benzene removal
  • Process and equipment for negative pressure benzene removal
  • Process and equipment for negative pressure benzene removal

Examples

Experimental program
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Effect test

Embodiment 1

[0026] Embodiment 1, a kind of negative pressure debenzene method, it comprises tower body, debenzene tower rich oil inlet 21, tower top gas phase outlet 16, light benzene return flow port 17, heavy benzene outlet 18, naphthalene oil outlet 19, lean oil The debenzene tower 2 that exports 25 etc. forms, and its flow process is:

[0027] (1) Use the vacuum pump 7 to pump air so that the pressure of the oil-rich debenzene and oil washing regeneration system is a negative pressure of 0.06-0.07Mpa,

[0028] (2) The temperature of the rich oil from the benzene washing section is ~30°C, and the temperature of the hot lean oil from the debenzene tower 2 is raised to 180-200°C through the lean-rich oil heat exchanger 1 and enters the stripping section of the debenzene tower ;

[0029] (3) The temperature of the light benzene vapor obtained at the top of the debenzene tower is 40-45°C, and after being condensed by the condenser 6, oil-water separation is carried out through the oil-wat...

Embodiment 2

[0033] Embodiment 2, a negative pressure debenzene method, which comprises a tower body, a debenzene tower rich oil inlet 21, a gas phase outlet 16 at the top of the tower, a light benzene return port 17, a heavy benzene outlet 18, a naphthalene oil outlet 19, and a lean oil The debenzene tower 2 that exports 25 etc. forms, and its flow process is:

[0034] (1) Use the vacuum pump 7 to pump air so that the pressure of the oil-rich debenzene and oil washing regeneration system is a negative pressure of 0.06-0.07Mpa,

[0035] (2) The temperature of the rich oil from the benzene washing section is ~30°C, and the temperature of the lean oil from the debenzene tower 2 is raised to 150°C through the lean-rich oil heat exchanger 1, and then enters the debenzene tubular heating furnace 3 The convection section continues to heat up to 180-200°C and enters the stripping section of the debenzene tower;

[0036] (3) The temperature of the light benzene vapor obtained at the top of the de...

Embodiment 3

[0040] Embodiment 3 The debenzene tower disclosed by the present invention is a variable-diameter tower whose lower part is a thicker stripping section 47 with a diameter, the middle is a tapered transition section 45, and the upper part is a thinner rectification section 42. The diameter ratio of the distillation section is 1:0.7-1, the oval head 41 at the top of the rectification section is equipped with a gas phase outlet 16 at the top of the tower, and at least 10 layers of PFG4.5 structured packing 44 and KCF gas-liquid distributor are installed in the rectification section 43. The tower body is provided with a light benzene return port 17, a heavy benzene outlet 18, and a naphthalene oil outlet 19; 19 layers of anti-clogging IV oblique hole double overflow trays 46 are installed in the stripping section, and the downcomer of adjacent trays The directions of the grooves are perpendicular to each other. The tower body is provided with a rich oil inlet 21, a regeneration oil...

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Abstract

The invention discloses a process and equipment for negative pressure benzene removal , belonging to technology and equipment for recovering resultant in the coking industry, in particular to technology and equipment for removing and recovering benzene contained in coke gas. To solve the problems existing in the prior art, the invention develops the process for non-steam and non-distillation debenzolization under the negative pressure operation condition is developed and designs a novel debenzolization tower thus the disadvantages of equipment and process for benzene removal by adopting tubefurnace for heating rich oil under normal pressure can be overcome. The invention mainly has the advantages that firstly, as benzene is removed by the negative pressure process, the boiling point of the benzene and the partial pressure of the benzene in gaseous phase are lowered, and the benzene can be removed without using direct steam for steaming and blowing, thus waste water generated by the steam is reduced and the environment can not be polluted; secondly, the productive rate of dry coal due to benzene removal is increased to be more than 1.35 percent from the original 1 percent, and the recovery ratio of the benzene is increased to be more than 35 percent; and thirdly, compared with the existing benzene removal process, the process reduces the energy consumption by more than 20 percent.

Description

technical field [0001] The invention belongs to coking industrial waste recovery technology and equipment, in particular to the removal and recovery technology and special equipment for benzene contained in coke oven gas. Background technique [0002] Benzene hydrocarbons are valuable chemical raw materials, coke oven gas generally contains benzene group hydrocarbons 25-40g / m 3 . The methods for recovering crude benzene from coke oven gas include oil washing absorption method, activated carbon adsorption method and deep condensation condensation method. Among them, the oil washing absorption method has been widely promoted because of its simple process, economical reliability. After the gas is cooled to 25-27°C by the final cooling tower, it passes through two benzene washing towers in sequence. The washing oil after benzene absorption has a benzene content of about 2.5% and is called rich oil. Oil, recycled. Generally, atmospheric pressure steam distillation is used for...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C10K1/18
Inventor 温燕明汤志刚姜爱国王登富江玉章张友棣陈善龙
Owner JINAN METALLURGICAL CHEM EQUIP CO LTD
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