Changchun desulfurization catalyst manufacturer Dongshi brand DST composite desulfurization catalyst

  DST composite desulfurization catalyst is a new desulfurization catalyst and a major improvement of desulfurization
It has the characteristics of high desulfurization efficiency, low operation cost, removal of organic sulfur while removing inorganic sulfur, strong ability of dissolving sulfur and so on
This is of special significance in the desulfurization process, especially in the desulfurization process (taking the synthetic ammonia plant as an example), the phenomena of deposited sulfur and attached sulfur, liquid turbidity and suspended sulfur are not easy to remove
The light one affects the desulfurization and has a large power consumption; Heavy tower blocking will seriously affect production
This desulfurization problem has puzzled the enterprise for many years and can not be completely solved in the end
Good desulfurizer not only has good desulfurization and low cost, but also solves the problems of tower blocking, deposition of attached sulfur and regeneration solution, prolongs the equipment maintenance cycle and service life, and is conducive to the regeneration of catalyst in the later section, showing a unique sense of superiority

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Main properties 2
1 DST composite desulfurizer is a solid powder, which can be dissolved in water and more easily soluble in dilute ammonia and Na2CO3-NaHCO3 solution
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2 desulfurization performance when used, the desulfurization performance depends on the concentration of ammonia, Na2CO3 solution and composite tannin (oxidized state)
The reaction formula is: NH3 & middot; H2O+H2S  = NH4HS+H2O  (1)Na2CO3+H2S  = NaHCO3+NaHS  (2) Polyphenols (oxidized) + HS-→ Polyphenols (reduced) + S & DARR (3) The desulfurization performance is not only related to the concentration of NH3, H2O and Na2CO3, but also related to temperature, pressure and equipment
Generally speaking, the desulfurization effect is good if the temperature is low, the pressure is high, and the gas and liquid are in good contact during desulfurization, otherwise it is the opposite
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3 regeneration performance regeneration refers to that the solution after desulfurization (commonly known as rich solution) is injected with air to restore it to the solution before desulfurization (commonly known as lean solution)
The purpose of regeneration is to regenerate HS - ions in the desulfurization solution into elemental sulfur
The reaction formula is as follows: polyphenol (reduced state) + O2 & rarr; Polyphenols (oxidized) , (4) Polyphenols (oxidized) + HS - → Polyphenols (reduced) + S & DARR (5) The above reactions (1) and (2) are carried out successively to turn HS ions into sulfur to the greatest extent
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4 side reaction there are always some side reactions in the desulfurization regeneration process, and the side reaction products mainly include Na2S2O3, Na2SO4 and NaSCN
Na2S2O3 and Na2SO4 are formed by further oxidation of sulfur
The detailed reaction equation is as follows: , 2NaHS + 2O2 = Na2S2O3 + H2O  (6)  2Na2S2O3 + O2 = 2Na2SO4 + 2S↓ (7)  Na2CO3 + HCN = NaCN + NaHCO3  (8)  NaCN + S = NaCNS  (9)  NH3· H2O + HCN = NH4CN + H2O  (10)  NH4CN + S = NH4CNS  (11) from the chemical equation of desulfurization reaction, the whole desulfurization reaction does not consume soda ash
However, due to the presence of side reactions, some of the Na2CO3 is converted into sub salts Na2S2O3, Na2SO4 and NaCNS, coupled with the loss of sulfur foam and the loss of solution
Therefore, in actual production, Na2CO3 still has a certain amount of consumption
According to the empirical value, the removal of 1kg H2S takes about 0
4-0
6kg of soda
The formation of secondary salt has a great impact on the consumption of soda ash
For example, semi water gas generally contains hcn0 05-0
2g/nm3, if hcn0
5 is removed According to 1g / Nm3 calculation, it takes about 1
26kg of alkali to produce a ton of synthetic ammonia
Therefore, if the semi water gas contains 1g / Nm3 of H2S, the actual soda consumption per ton of synthetic ammonia is about 1
5-2
0kg

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Use method 3
1 when switching from other desulfurization methods to DST composite desulfurization catalyst, do not stop production, discharge or replace the original desulfurization solution, just stop adding the original desulfurization catalyst and add DST composite desulfurization catalyst instead
Double the normal amount in the first week, and add it in the normal amount after a week
The normal addition amount is as follows (taking the H2S content of semi water gas as 2G / Nm3, and the H2S content of shift gas as & le; 200mg / Nm3 as an example): synthetic ammonia output (10000 tons / year) , Addition amount of DST composite desulfurization catalyst (kg / D) , 6  1
5-3 （0
5-1）  10  3-5  （1-1
5）  15  4-6  (1
5-2) Description: the number in the symbol () refers to the desulfurization addition amount of variable ventilation gas, and the number outside () refers to the desulfurization addition amount of semi water gas
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2 without other pretreatment, DST composite tannin can be directly added to the lean solution tank
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3 for H2S content before and after desulfurization, the content of polyphenols in tannin extract is determined by iodometry
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4 composition of desulfurization solution: generally, the total alkali is 20-35g / L, the Na2CO3 / NaHCO3 (mass) ratio is 1 / 5-1 / 7, and the content of polyphenols (expressed in hydroquinone) is 0
05-0
15g/l
Suspended sulfur shall be less than 1
0g/l, preferably about 0
5g/l
Na2S2O3, Na2SO4 and NaCNS shall regularly analyze the quality and fill in the report

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Advantages and disadvantages
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1 DST compound desulfurizer is non-toxic and widely used
It can be used in the desulfurization process of semi water gas and shift gas in synthetic ammonia production, as well as natural gas, coke oven gas, city gas, tail gas of pharmaceutical factory and refinery gas
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2 strong sulfur dissolving capacity: it has a highly active removal effect on the deposited sulfur and attached sulfur in the system, has a strong tower cleaning function, and can solve the tower blocking phenomenon
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3 good regeneration: there are many suspended sulfur, large sulfur particles, loose and easy to separate
The liquid cleaning and circulation are smooth, the power consumption is reduced, and the regeneration efficiency is high
While improving the desulfurization efficiency, the production cost can be reduced

For more experience and technology of desulfurization, please pay attention to WeChat official account: east lion desulfurization technology cooperation network Changchun east lion Technology (Group) Co
, Ltd
provides mobile phone 888 desulfurization catalyst, sulfur removal catalyst, sulfur dioxide, biogas, coke oven gas desulfurization catalyst, blast furnace gas desulfurization technology, various desulfurization equipment and other contact telephone: 0431-84505111 Mobile: 15725121076