Acid gas treatment in hydrogen sulfide stripping tower

Just a set for diesel hydrogenation? If there are other supporting devices, the gas phase can be recovered. Hydrogen sulfide can be recovered for use as other by-products through catalytic or coking dry gas desulfurization regeneration

Sodium hydrosulfide plants require low investment, but the market for sodium hydrosulfide is not very good

Acidic gas can meet the combustion standards after alkali washing~~~~

Does this acidic gas contain both hydrogen sulfide and carbon dioxide? Sodium hydroxide also absorbs hydrogen sulfide and carbon dioxide at the same time. Although carbon dioxide is more acidic than hydrogen sulfide, hydrogen sulfide reacts more rapidly with sodium hydroxide (actually hydroxide ions). As a measure of acidic strength, carbonic acid (carbon dioxide) has pKa1=6.2 and pKa2=10.0 ； Hydrogen sulfide has pKa1=7.0 and pKa2=13.0. The reaction rate of hydrogen chloride with hydroxide ions is 460 times that of hydrogen sulfide with hydroxide ions. Therefore, there is a competition issue regarding the absorption of carbon dioxide and hydrogen sulfide, or in other words, an issue concerning the efficiency of using sodium hydroxide. Taking advantage of the fact that hydrogen sulfide is absorbed more rapidly than carbon dioxide due to its basicity, special absorption devices can be designed, one of which is a particularly short absorption tower. Another type is the double-membrane absorber. In other words, a membrane module contains two sets of membrane fibers; it is similar to a shell-and-tube heat exchanger that has evenly distributed copper tubes and aluminum tubes, but it features 4 tube-side outlets, with the aluminum tubes having common inlet and outlet ports, and the copper tubes also having common inlet and outlet ports. For example, the hot material can flow through the copper tubes, while the cold material flows through the aluminum tubes, so that they do not interfere with each other. Copper tubes and aluminum tubes share the shell side. A double-membrane absorber is a similar device, except that microporous hydrophobic hollow fiber membranes are used in place of copper and aluminum tubes. In practice, the shell side is filled with a sodium carbonate solution, while an acidic gas stream flows through the tube side of one set of membrane fibers; sodium hydroxide, on the other hand, flows through the membrane fibers of another set. There are 5 mass transfer resistances for the absorption of hydrogen sulfide from the feed gas into sodium hydroxide, with no interfacial reaction kinetics resistance ； When carbon dioxide is absorbed from the feed gas into scandium hydroxide, in addition to 5 mass transfer resistance factors, there are also 4 interfacial reaction kinetics resistance factors, and the reaction kinetics resistance factors are much greater than the mass transfer resistance factors. In this way, the purity of the resulting sodium hydrogen sulfide acid and sodium sulfide is very high, with almost no carbon dioxide (sodium carbonate) present. Our company produces membrane absorbers with this double-membrane design.

Sodium hydrosulfide is produced using an alkaline washing unit; if there is a large amount of acid gas, one can directly contact the manufacturer who provided the technology to discuss potential solutions for dealing with the subsequent disposal of sodium hydrosulfide