Increase CO2 production
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Today I read a post about increasing carbon dioxide production, and an idea occurred to me. Please see if this nonsense is feasible! :lol Molecular sieve technology is now very mature. The improvement of CO2 production can be achieved through the following ideas. The exhaust gas from the exhaust scrubber is absorbed by molecular sieves, because molecular sieves mainly absorb water, CO2 and olefins [the molecular sieves (activated alumina, silica gel) used in air separation have this characteristic, other molecular sieves may have other characteristics, I think this is applicable]. When the exhaust gas passes through the molecular sieve, water and CO2 are mainly absorbed. After analysis, relatively pure CO2 will be obtained. (I heard that the purity of oxygen produced by molecular sieves can reach 99%).
This conjecture is not feasible. 1. The gases obtained from the methanol washing section are H2 and CO2. After this H2 is synthesized into NH3 to produce urea, the amount of CO2 required is about half of the total amount of CO2 in the CO2 analysis tower and the tail gas, so it is of little significance to recover the CO2 in the tail gas. 2. The CO2 concentration in the exhaust gas is very high. If molecular sieve is used to absorb it, the molecular sieve will reach saturation in a very short time. This idea seems difficult to solve industrially. 3. If we study the methanol washing process itself, there are ways to increase CO2 production. The pressure of the CO2 analysis tower can be slightly reduced, and the CO2 production can be significantly improved, but attention should be paid to the methanol and H2 content in the CO2 gas, as well as the purity of the CO2 ； Alternatively, the system temperature can be slightly increased to allow CO2 to be analyzed as much as possible in the front system, which can also increase CO2 production to a certain extent.
I don’t think so! Because the ammonia contained in the exhaust gas can easily cause clogging of molecular plugs, it is not suitable for continuous production operations!
Haha, now the molecular sieves are switched regularly! You can set a few hours to switch for a while, and it is very mature in application in air separation! If the adsorption is fast, the adsorption time can be designed to be shorter! There are no standards for CO2 emissions now. If quotas are issued to each factory in the future, someone will find a way! Nowadays, CO2 has many uses, not only in urea. CO2 has many uses: (1) In the petroleum mining industry, injecting one ton of CO2 liquid into the oil well can increase crude oil production by 3-5 tons. (2) In the machine casting industry, CO2 is an additive. (3) In the metal refining industry, especially high-quality steel, stainless steel, and non-ferrous metals, CO2 is a quality stabilizer. (4) Ceramic pond porcelain industry, CO2 is the fixative. (5) Biopharmaceuticals are inseparable from CO2. (6) In the beverage and beer industry, CO2 is an additive for digestion and appetizing. (7) When making yeast mother powder, CO2 is an agonist. (8) In fire protection industry, CO2 is the fire extinguishing agent. (9) Making dry ice is inseparable from CO2. (10) All green plants perform photosynthesis, and CO2 is a main raw material. People's daily clothing, food, housing, and transportation are also products of CO2, etc.
Molecular sieves only absorb a small amount of gas! It is not suitable for large flow adsorption. Molecular sieve is mainly used to adsorb water. If it is to adsorb carbon dioxide, it will definitely require an adsorbent and it is easily saturated. I wonder if the carbon dioxide can be evaporated?