Sulfur Daily Question, March 18------Participate in 8 Wealth

The rich solvent coming from the upstream unit undergoes flash evaporation at moderate temperature and low pressure in a flash tank, during which most of the dissolved hydrocarbons are removed. It then enters the regeneration tower, where it is heated by steam to reach the desorption temperature of the solvent, allowing H2S, CO2, and other substances adsorbed by the solvent to be separated. The poor solvent is sent back to the upstream unit for reuse.

The process principles for desulfurization are the same for dry gas, liquefied gas, coking rich gas, and low-pressure sulfur-containing gases obtained through hydroprocessing, as well as the exhaust gases from sulfur recovery units. First, at low temperatures, H2S and CO2 undergo chemical reactions with the solvent to form unstable complexes that enter the solution, thereby purifying dry gas, liquefied gas, enriched gas, and natural gas. This complex then decomposes at high temperatures, releasing H2S and CO2, thereby allowing the solvent to be regenerated for reuse.

This post was last edited by Sulfur-Zinc-Aluminum on 2016-3-20 08:39. Alkyl amines are used to remove H2S (acidic gases) through chemical absorption, and then the H2S-containing concentrated solution is regenerated via stripping. The basis for this mechanism is that H2S and CO2 dissolved in water are slightly acidic and react with amines (which are weakly basic) to form salts that decompose at high temperatures. The amine solution used for desulfurization contains at least one hydroxyl group and one amino group; the hydroxyl group serves to reduce the vapor pressure and increase water solubility, while the amino group helps to achieve the necessary alkalinity in the aqueous solution, thereby facilitating the absorption of acidic gases.

The rich solvent coming from the upstream unit undergoes flash evaporation at moderate temperature and low pressure in a flash tank to remove most of the dissolved hydrocarbons; thereafter, it enters the regeneration tower where it is heated by steam to the desorption temperature, allowing sulfur hydrogen, carbon dioxide, and other substances adsorbed by the solvent to be separated. The poor solvent is then returned to the upstream unit for reuse.

Briefly describe the process principle of the solvent regeneration unit. After the waste organic solvents are delivered to the plant in barrels, they enter the feed tank V401 via the feed pump P301 for storage. Once the requirements for batch processing are met, they are sent to the electrically heated reactor H201 through the feed pump P302, where the light and heavy components are separated. The light components are condensed in condenser E401 and then sent to intermediate product tank V401, while the heavy components are placed in barrels and taken to the solid waste temporary storage area, from where they are sent to an external contractor for disposal. The intermediate product in V401 is pumped via intermediate product pump P303 into distillation tower T02 for distillation. The product obtained after distillation is condensed by condenser E402 and then enters product reflux tank V402, where it is refluxed via reflux pump P304; the product is drawn off at the outlet line of the reflux pump. The organic wastewater separated through distillation is pumped via pump P305 into a wastewater collection tank for temporary storage, and is then sent to the Luoyang Petrochemical Wastewater Treatment Plant for further treatment. The organic gases that cannot be recovered by each condenser are discharged into the atmosphere collectively through exhaust stacks with a height of no less than 15 meters.

What is the process principle of the solvent regeneration unit? Dry gas, liquefied gas, coking rich gas, low-pressure sulfur-containing gas obtained through hydroprocessing, and the exhaust gases from sulfur recovery units all operate on the same principle: first, H2S and CO2 undergo chemical reactions with a solvent at low temperatures to form unstable complexes, thereby purifying the dry gas, liquefied gas, rich gas, and gas; these complexes then decompose at high temperatures, releasing H2S and CO2 and allowing the solvent to be regenerated.

The amine solution is alkaline at room temperature and absorbs hydrogen sulfide; at temperatures above 100 degrees, it becomes neutral and releases the hydrogen sulfide, thereby regenerating itself.

Briefly describe the process principle of the solvent regeneration unit? Answer: The rich solvent coming from the upstream unit undergoes flash evaporation in a flash tank at moderate temperature and low pressure to remove most of the dissolved hydrocarbons; it then enters the regeneration tower, where it is heated by steam to reach the desorption temperature of the solvent, allowing H2S, CO2, and other substances adsorbed by the solvent to be separated. The poor solvent is returned to the upstream unit for reuse.

Is what you’re answering about is the solvent regeneration in sulfur units?

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