Gas replacement process, gas replacement apparatus, and nitro compound hydrogenation reaction process
AssigneesChina Petroleum & Chemical Corporation, Shanghai Research Institute of Petrochemical Technology, Sinopec
InventorsSiqing ZHONG, Jun XU, Le ZHAO, Lianghua WU
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Abstract
A gas replacement process and a gas replacement apparatus are employed, in the nitro compound hydrogenation reaction process. The gas replacement process at least includes a first step of subjecting a stream to be replaced to the gas replacement in presence of a first replacement gas, and then a second step of subjecting to the gas replacement in presence of the second replacement gas. Assuming the superficial velocity of the first replacement gas is V1, and the superficial velocity of the second replacement gas is V2, then V2/V1≥1.5.
Claims20
A gas replacement (for example stripping or degassing) process, which at least comprises a first step for the gas replacement of a stream to be replaced (for example liquid stream or solid stream, especially solid particle) in the presence of a first replacement gas (for example gas or vapor or steam) (referred to as a first gas replacement step), and then a second step for the gas replacement in the presence of a second replacement gas (for example gas or vapor or steam) (referred to as a second gas replacement step), wherein assuming that the superficial velocity of the first replacement gas (absolute value, the unit is m/s) is V1, and the superficial velocity of the second replacement gas (absolute value, the unit is m/s) is V2, then V2/V1≥1.5, 100≥V2/V1≥2, 20≥V2/V1≥2.5 or 15≥V2/V1≥5.
A gas replacement apparatus (for example stripper or degassing tank), which at least comprises a first gas replacement region (especially a first vertical gas replacement region) and a second gas replacement region (especially a second vertical gas replacement region) (for example communicated in succession or in series), wherein the inlet for the stream to be replaced of the first gas replacement region is located in the upper part of the first gas replacement region, and the outlet for the replaced stream of the second gas replacement region is located in the upper part of the second gas replacement region;
- and assuming the cross-sectional area (the unit is m2) of the middle part of the first gas replacement region is A1, and assuming the cross-sectional area (the unit is m2) of the middle part of the second gas replacement region is A2, then 100≥A2/A1≥1.5, 50≥A2/A1≥2.5 or 15≥A2/A1≥5.
Dependencies are inferred from the claim text.