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Refinery dry gas separating and recycling process

A technology for separation and recovery, refinery dry gas, applied in hydrogen separation, separation methods, dispersed particle separation, etc., can solve the problems of unfavorable recycling, high investment and operating costs, and low gas purity

Active Publication Date: 2017-05-24
CHINA PETROLEUM & CHEM CORP +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0012] Judging from the above-mentioned domestic and foreign refinery dry gas recovery technology itself and the actual application effect, the low-temperature condensation method and the low-temperature absorption method need to increase the pressure and lower the temperature of all dry gas components, so the investment and operation costs are relatively high; the existing Although the investment and operating costs of the adsorption process are relatively low, the C 2 + component recovery rate is not high, recovered C 2 +The purity of the component product gas is not too high, which not only affects the recycling of C 2 + itself is unfavorable, and it also limits the further recycling of hydrogen to a certain extent; the membrane separation method can only be used in the separation and recovery of hydrogen in dry gas, and it is difficult to directly obtain high-concentration hydrogen from dry gas by relying on membrane separation itself. Hydrogen products

Method used

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  • Refinery dry gas separating and recycling process
  • Refinery dry gas separating and recycling process
  • Refinery dry gas separating and recycling process

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0094] The catalytic dry gas discharged from the absorption and stabilization unit of a refinery catalytic unit and then the top of the absorption tower is desulfurized by the desulfurization facility and then enters the pressure swing adsorption device for adsorption and separation. The dry gas flow rate is 20,000Nm 3 / h, operating pressure 1.2MPa(g), operating temperature 40°C, see Table 1-1 for dry gas composition,

[0095] Table 1-1 Composition of Raw Gas in Example 1

[0096]

[0097] The target product component of dry gas separation and recycling in this embodiment is C 2 + Components, PSA unit process flow such as figure 1 shown. The device has 12 seats of 30m 3 The adsorption beds are numbered A to L, and the adsorption beds are filled with four kinds of adsorbents: activated alumina, silica gel, activated carbon and molecular sieve. The main equipment of the device also includes 1 set of first-stage vacuum pump (P1), 1 set of second-stage vacuum pump (P2), 1 s...

Embodiment 2

[0124] The coking dry gas discharged from the absorption and stabilization unit of the coking unit in a refinery and then the top of the absorption tower is desulfurized by the desulfurization facility and then enters the pressure swing adsorption device for adsorption and separation. The flow rate of the coking dry gas is 20,000Nm 3 / h, the operating pressure is 1.2MPa(g), the operating temperature is 40°C, and the dry gas composition is shown in Table 2-1.

[0125] Table 2-1 Raw material gas composition of Example 2

[0126]

[0127] Due to the low hydrogen concentration in the raw material dry gas, the target product component of the dry gas utilization of this device is C 2 + components. The process flow of the pressure swing adsorption unit is as follows: figure 1 shown. The device has 12 seats of 30m 3 The adsorption beds are numbered A to L, and the adsorption beds are filled with four kinds of adsorbents: activated alumina, silica gel, activated carbon and molec...

Embodiment 3

[0153] The catalytic dry gas discharged from the absorption and stabilization unit of a refinery catalytic unit and then the top of the absorption tower is desulfurized by the desulfurization facility and then enters the pressure swing adsorption device for adsorption and separation. The dry gas flow rate is 20,000Nm 3 / h, the operating pressure is 1.2MPa(g), the operating temperature is 40°C, and the dry gas composition is shown in Table 3-1.

[0154] Table 3-1 Composition of Raw Gas in Example 3

[0155]

[0156] The target product component of dry gas separation and recycling in this embodiment is C 2 + Components, PSA unit process flow such as figure 2 shown. The device has 12 seats of 30m 3 The adsorption beds are numbered A to L, and the adsorption beds are filled with four kinds of adsorbents: activated alumina, silica gel, activated carbon and molecular sieve. The main equipment of the device also includes 1 set of first-stage vacuum pump (P1), 1 set of second-...

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Abstract

The invention discloses a refinery dry gas separating and recycling process. At least one one-section pressure swing adsorption unit is contained, wherein at least two adsorption beds filled with adsorbents are arranged in the one-section pressure swing adsorption unit; the adsorption beds run alternatively in set time sequence steps; each adsorption bed is at least sequentially operated through following process steps: adsorption, reduced pressure equalization, concentration, reversal exhaust, vacuum pumping, pre-adsorption, increased pressure equalization, finally charging and the like. After dry feed gas is separated by one pressure swing adsorption unit, two flows of C2<+> component product gas and hydrogen-rich product gas with the concentration of C2<+> components larger than 92v% and the recovery rate larger than 92% can be obtained. Compared with the prior art, the process has simpler procedures and is lower in investment and operation cost, and the yield of the C2<+> components and the product purity are higher; if necessary, three flows of C2<+> component product gas, hydrogen product gas and fuel gas can be obtained after dry feed gas are separated by the one-section pressure swing adsorption unit and a two-section pressure swing adsorption unit.

Description

technical field [0001] The invention relates to the technical field of comprehensive recovery and utilization of refinery dry gas, in particular to separation and recovery of C in refinery dry gas through pressure swing adsorption. 2 + component, or separation and recovery of C in refinery dry gas 2 +Process of components and hydrogen. Background technique [0002] The catalytic cracking unit and the delayed coking unit are two important secondary processing units in the petroleum processing process, and their main task is to crack the heavy oil mainly with long-chain macromolecular hydrocarbons into light fuel oil with short-chain small molecular hydrocarbons. . In the actual production process, accompanied by cracking reactions, side reactions such as dehydrogenation, hydrogenation, hydrogen transfer, isomerization, aromatization, and condensation will also occur to varying degrees. The final reaction product contains H 2 、C 1 (Methane containing 1 carbon atom in the ...

Claims

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Application Information

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IPC IPC(8): B01D53/047B01D53/053C01B3/50C10L3/10
CPCB01D53/0476B01D53/053B01D2259/40039C01B3/508C10L3/101
Inventor 张国瑞张涧后磊罗运柏胡小鹏徐宝岩徐朋朋涂安斌刘旭东杨洪川陈亚洲
Owner CHINA PETROLEUM & CHEM CORP