Epichlorohydrin production technologies: What are the advantages and disadvantages of the traditional saponification method, the glycerol method, and the hydrogen peroxide method? Which one is more successful...
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This post was last edited by Guderian on 2016-6-18 09:49. Epichlorohydrin production technologies: What are the advantages and disadvantages of the traditional saponification method, the glycerol method, and the hydrogen peroxide method? Which one has a greater cost advantage? Epichlorohydrin is an organochlorine compound as well as an epoxide. It is a colorless liquid with an irritating odor similar to that of garlic; it is insoluble in water but soluble in most polar organic solvents. Epichlorohydrin is highly reactive and is used in the production of plastics and synthetic rubber. Traditional saponification method: ① Allyl chloride (chloropropene) undergoes a hydrochlorination reaction with hypochlorous acid to yield two mixed alcohols ； ② Saponification reaction: the mixed alcohol reacts with a base to produce epichlorohydrin (ECH). Glycerol method: ① Glycerol dichloropropanolization reaction, in which glycerol reacts with anhydrous hydrogen chloride to produce dichloropropanol ； ② In the saponification reaction, epichlorohydrin (ECH) is produced within the reaction tower, which is similar to the traditional saponification process. Hydrogen peroxide method: Allyl chloride (chloropropene) reacts directly with hydrogen peroxide to produce epichlorohydrin (ECH). May I ask: what are the advantages and disadvantages of the traditional saponification method, the glycerin method, and the hydrogen peroxide method? Which process has a greater cost advantage?
This post was last edited by zqwqiwu123 on 2016-6-20 15:59. The first method: it’s not really circular economy! There is no policy advantage, and the investment is substantial. The amount of wastewater generated is high, there are strict requirements for supporting facilities, and high production levels are also required; otherwise, costs will increase. First method: Low investment, and it falls under the circular economy. The wastewater volume is low, which gives an advantage from a policy perspective; however, the current cost is comparable to that of the propylene method, and it may even be higher. The yield requirement is not high. First method: Wastewater has clear advantages as it is salt-free. However, catalyst recycling is difficult, and there are currently no commercial-scale implementation cases. The aforementioned R&D stage.
For the direct oxidation method using hydrogen peroxide. The catalyst can be shaped into a fixed-bed configuration, or a slurry bed-membrane separation system can be utilized. Currently, by drawing on ammonia oximation technology, we are developing a slurry-bed-membrane separation coupled reaction technique suitable for the production of propylene oxide and chloropropylene oxide.
{:3_54:} We’re using Plan B; it’s estimated that production will start by the end of this year. The market is poor right now, so any money we make will probably just be enough to buy some bread
It’s a good approach; I hope it will be successful.
Technologies for the distillation, separation, and purification of the materials resulting from the reaction, as well as components for packed towers – if needed, you can turn to Kefukai Process Equipment (Shanghai) Co., Ltd., which possesses relevant engineering experience in this area.
May I ask: what are the advantages and disadvantages of the traditional saponification method, the glycerin method, and the hydrogen peroxide method? Which process has a greater cost advantage? If water treatment costs are not taken into account, traditional saponification is the most advantageous method; however, plants that do not carry out such treatment have basically been shut down. Therefore, using sodium hydroxide for saponification is the best option, and the resulting brine can be treated and reused in ion membrane electrolysis units
Binhua Group has propylene oxide produced by the glycerol method
I’m not sure how the development is progressing. It seems that Yangnong Chemical has succeeded in its development, but I’m not aware of how this process performs