Has anyone done a project to synthesize methanol from carbide furnace exhaust gas?

This post was last edited by clq20040107 on 2010-9-28 20:05 Many domestic manufacturers have discussed that firstly, only the tail gas of closed calcium carbide furnaces has utilization value, secondly, the problem of tail gas purification has not been solved, and thirdly, there is a serious shortage of hydrogen in the composition. The fourth problem is that the scale is too small. 640,000 tons of calcium carbide and 13 calcium carbide furnaces. How to purify and collect gas? How to maintain a stable supply is very complex in factory design. In fact, making carbonyl chemicals is a good choice.

The exhaust gas collected from 640,000 tons of closed calcium carbide furnace contains 247,000 tons of CO (equivalent to 100%). This is a large amount and fully meets the conditions for the development of chemical products. If methanol is produced, the source of hydrogen can be obtained by considering water gas shift. The theoretical value of CO consumed by methanol after conversion is 2.625 tons/ton. Methanol, the tail gas of 100,000 tons of calcium carbide can produce 14,700 tons of methanol after purification, and the tail gas of 640,000 tons of calcium carbide can produce 94,000 tons of methanol. The cost of methanol is about 920 yuan/ton (only the fixed asset investment cost of CO amortization is calculated). If methanol is used as raw material to develop other chemical products, the benefits will be better. The problem of furnace gas purification has been solved. Through dry dust removal and then desulfurization and CO2 removal, the synthesis gas requirements for methanol production can be met. After water gas conversion, PSA can be used to separate the synthesis gas. This post was last edited by edc1233 on 2008-10-31 12:24 ]

continue my thoughts: A part of the gas can be separated and the carbon-to-hydrogen ratio can be roughly adjusted using a conversion device, and then the membrane separation can be used to fine-tune it, while the carbon components are processed separately. Then the synthesis is OK. I don’t agree with adding water and coal gasification equipment. In that case, there will be no environmental protection and circular economy advantages at all, and the investment will be large. If I had to do that, I would be willing to send the gas to the boiler of the power plant to burn it to generate electricity, which would indirectly reduce the power consumption of the calcium carbide furnace, haha! This post was last edited by tfx511024 on 2008-6-30 19:48 ]

In fact, the current domestic calcium carbide industry is relatively fragmented. On the one hand, there are many calcium carbide production companies. On the other hand, the scale of calcium carbide production companies is generally small, and there is no condition for collecting exhaust gas. Personally think: Furnace gas purification and treatment technology is not a problem, the key is scale. It is best to reach more than 400,000 tons of calcium carbide to comprehensively develop oxo synthesis products.

Coal-to-syngas originally has more carbon and less hydrogen, so it needs to be transformed, so it can be directly transformed with furnace gas. It is ideal to be compatible with coke oven gas, which is rich in hydrogen. Reasonable coordination can minimize energy consumption. If there is no coke oven gas, it is also ideal to produce synthesis gas from natural gas.

In fact, gas-fired lime kiln is a good choice.

They are all masters, their analysis is thorough, good

The key is how to remove the tar in the furnace gas.

Can tar be removed by activated carbon adsorption and filtration?

At present, calcium carbide furnace gas cannot be further processed, mainly because there are problems with the purification process of calcium carbide furnace gas. If this problem can be solved, the rest will be very simple!