Treatment methods and processes for gas H2S

Sulfur removal process Existing sulfurization process: Solvent desulfurization and redox after Claus desulfurization. Dissolved by physical and chemical methods, the solvent method can absorb acidic gases from natural gas.

H2S and CO2 are released by heat, and the chemical solution can be reused. The Claus desulfurization method consists of a two- to three-step catalytic reaction that converts H2S to SO2 and then to S. The redox method is to directly convert H2S into S and H2O in a colloidal solution of ferric oxide, although this method has a high conversion rate, it still has problems such as high treatment cost and difficulty in waste disposal.

New technology for sulfur removal: In order to meet the needs of environmental protection and the removal of low concentrations of sulfur, crystasulf and thiopaques processes are used. The Crystasulf process is after the Claus two-step desulfurization method, using organic solvents to absorb low concentration of the process, first using alkaline solution and H2S reaction to generate HS-, and then using biological oxidation reaction to generate the company's advanced catalytic reaction technology can make H2S directly oxidized to generate S and water, the key to this method is to control the ratio of air, the temperature of the reaction gas, the temperature and rate of the generated gas.

By comparing the cost, environmental impact and by-products of several processes, it was concluded that Xergy's advanced catalytic reaction technology was inexpensive and easy to operate.

At present, the Claus process is an ideal process for the treatment of high-content hydrogen sulfide gas. With low development investment, simple operation and low operating cost, the acid gas treatment process to meet the requirements of environmental protection is of great practical significance. At the same time, with the rapid development of the petrochemical industry and the continuous improvement of people's living standards, natural gas, coke oven gas and coal gas are increasingly used as raw materials for petrochemical industry, civil and industrial fuels.

These gases all contain a certain amount of hydrogen sulfide and organic sulfur. H<,2>S and its combustion products SO<,2> are the main sources of air pollution and acid rain. In addition, in the process of refining and chemical production, the sulfides contained in the oil will produce a large number of sulfur-containing compounds such as hydrogen sulfide, and most of the petroleum products are washed with sodium hydroxide solution.

At present, domestic oil refineries generally use concentrated sulfuric acid neutralization method to treat waste alkali, or neutralize waste acid in the production process. Although this method is simple, the anti-corrosion requirements of the device are high, the equipment investment is large, the operation is difficult, and the inorganic phase after treatment cannot be improved, which causes secondary pollution to the environment, and the treatment cost is high. Therefore, finding a suitable treatment method has become an urgent problem.

In this paper, the acid gas of the refinery contains a large amount of carbon dioxide and waste alkali for carbide, and the generated alkali is used to absorb hydrogen sulfide to achieve waste treatment.

At present, the general atmospheric hydrogen sulfide exceeds 500mg, and the wet desulfurization technology will be used, and the dry desulfurization technology will be used for small gas volume and low hydrogen sulfide. At present, the wet process mainly includes DF888 method and complexed iron method. Tangshan is a bit more professional.

Dry desulfurization is used for low hydrogen sulfide content, and wet desulfurization is used for high hydrogen sulfide content.

Treatment process for gases with low H2S content.

Oil & Gas Chemicals >> 2001.03.

H2S is hydrogen sulfideHydrogen sulfide is an inorganic compound.

The chemical formula is H2S. Under normal circumstances, it is a colorless, flammable acid gas, with a foul odor and a smell like rotten eggs when the concentration is low; When the concentration is high, there is no odor. It is soluble in water, and at 0 °C, 1 mole of water can dissolve about moles of hydrogen sulfide.

Soluble in alcohols, petroleum solvents and **. Shirt Qi.

The aqueous solution of hydrogen sulfide is called hydrosulfuric acid.

It is a weak acid.

When it is heated, hydrogen sulfide escapes out of the water again.

Main uses:It is used in the synthesis of phosphors.

Manufacture of electric discharge, light conductor, photoelectric meter, etc. Organic synthesis of reducing agents.

It is used in metal refining, pesticides, medicine, and catalyst regeneration. General purpose reagents. Preparation of various sulfides.

It is used in the manufacture of inorganic sulfides and is also used in chemical analysis such as the identification of metal ions.

The above content reference: Encyclopedia - Hydrogen sulfide.

Sulfides, such as sodium sulfide, ferrous sulfide, or other acids, sulfate hydrochloric acid.

1. H2S is hydrogen sulfide, hydrogen sulfide is an inorganic compound, the molecular formula is H2S, the molecular weight is, it is a flammable acid gas under standard conditions, colorless, there is a smell of rotten eggs at low concentration, and there is sulfur smell when the concentration is very low, and it is highly toxic. Its aqueous solution with lead is hydrosulfuric acid, which is weaker acidic, weaker than carbonic acid, but stronger than boric acid. Molecular structure:

The central atom S atom adopts sp3 hybridization (the actual result calculated according to the bond angle is close to the p3 hybridization) large impulse, the electron pair configuration is regular tetrahedral shape, the molecular configuration is v-shaped, the h—s—h bond angle is, dipole moment, and it is a rolling polar molecule. Due to the weak H—S bond energy, about 300 hydrogen sulfide decomposes.

2. Ignition point: 260, saturated vapor pressure: solubility: soluble in water (dissolved proportion: ethanol, carbon disulfide, glycerin, gasoline, kerosene, etc.) Critical Temperature:,Critical Pressure:.

The formula is as follows: (Qi leakage is an example in parentheses, and H2S is taken as an example below).

k = m + n when k = 2 sp hybridization.

k = 3 sp2 hybridization.

k = 4 sp3 hybridization.

where the value of n is n in abn, the number of atoms bound to the central atom (in this case n is 2 in h2s) (central atom: literally, the atom that is formed as the center, and the central atom of h2s is s).

m=(e-nd)/2

m: number of lone electron pairs (refers to unbonded electrons).

e: the number of valence electrons of the central atom (the number of gametes in the valence search is the number of electrons in the outermost shell.)

s e=6).

n: The same value as n above.

d: the maximum number of electrons that can be received by the atom that binds to the central atom (the atom bound to the central atom refers to the h atom, and the outermost difference is 1 electron full, where d = 1).

Thus, k=2+(6-2*1) 2=2 for H2S

Therefore, H2S is sp3 hybridization.

1) Hydrogen sulfide.

It's sp3 hybrid (look at the landlord's problem, I thought I miscalculated, calculated several times).

2) The central atom of polyatomic substances is regarded as the substance with the most bound atoms at the high school stage, but in fact, the hybrid type should say that "the X atom in the XYZ molecule is sp?".hybridization".

3) Judgment of the hybrid type of polyatoms (e.g. O2F2): the sum of the number of atoms n (one o and one f, denoted as 2) and the number of lone electrons m m directly bound to the central atom (o), i.e.

k = m + n when k = 2 sp hybridization.

k = 3 sp2 hybridization.

k = 4 sp3 hybridization.

See .........above part).

4) O2F2 is sp3 hybridized, so each oxygen atom.

The bonds are all tetrahedral type, and the bond angle should be.

H2S is hydrogen sulfide gas. Hydrogen sulfide is an inorganic compound with a molecular weight, soluble in water, a melting point of minus and a boiling point of minus, and is a flammable acid gas in the standard state, without color, with a rotten egg smell at low concentrations.

Sulfur hydrogen gas has the characteristics of severe toxicity, corrosiveness, flammability and explosiveness, unstable chemical properties, soluble in water, alcohols, petroleum solvents and **, the aqueous solution is hydrogen sulfuric acid, and the acidity is weak.

Hydrogen sulfide gas is an important chemical raw material, which can form a mixture when mixed with air, and can easily cause combustion if it encounters an open flame.

Hydrogen sulfide gas has a wide range of uses, which can be used to make phosphors, light conductors, etc., or organic synthesis reducing agents, used in metal refining, pesticides, medicines, catalysts, etc., and can also be used to prepare various sulfides.