Method and process for the manufacture of vinyl trifluoride

The greenhouse effect coefficient (gwp) of vinyl chloride trifluoride is small, so it has been highly anticipated in recent years as a new refrigerant to replace the greenhouse gases difluoromethane (hfc-32 ) and 1,1,2,2 -pentafluoroethane). In addition, in this manual, for halogenated hydrocarbons, the abbreviation of the compound (refrigerant number, etc.) is entered in parentheses after the name of the compound. In addition, the compound name is replaced by its abbreviation as needed. So, let's learn about the manufacturing method and process of vinyl chloride trifluoride together below!

In addition, there are problems such as the following. In other words.

1) The adhesion between calcium hydroxide particles is high, solidification occurs and some of the reactors are prone to clogging.

2) In the reaction between calcium hydroxide and hfc-134a, a large amount of water is generated as a by-product, so the process of removing water from the resulting hfo-1123 before it is used as a refrigerant has a high load

3) When calcium hydroxide is used in the reaction with hfc-134a, fluorocarboxylic acid and carboxylate salts are generated, so the yield of hfo-1123 is reduced and a large amount of water generated as a by-product reacts with hfo-1123 as a by-product.

Therefore, the conversion rate of hfc-134a and the yield of hfo-1123 are high, when using the cheap raw material hfc-134a to manufacture the new refrigerant hfo-1123 instead of greenhouse gases, and the blockage of the reactor and the load of the water removal process are low, hfo-1123

The composition of the solid phase other than calcium oxide is not particularly limited, for example a carrier for carrying calcium oxide can be listed.

As a reactor for reacting hfc-134a with calcium oxide, vinyl chloride trifluoride can be used as long as it is a reactor that can withstand the temperature and pressure inside the reactor as described later. The shape and structure are not particularly limited, for example, a cylindrical scribe type reactor can be cited. As materials for reactors, glass, iron, nickel, ferrous or nickel-based alloys can be used as examples. The reactor can also be equipped with a heating mechanism such as an electric heater in the heating vessel.

In the case of a continuous supply of gas-phase hfc-134a in contact with solid-phase calcium oxide fed into the reactor in batches, in addition, in the case of a fixed-bed type, it can be either a horizontal fixed-bed type or a vertical fixed-bed type, but in the case where the feed gas is a gas mixture consisting of multiple components, the solid-phase calcium oxide fed can be accommodated in the form of a fixed-bed type or a fluidized-bed type in the reactor. However, in order to improve the reactivity in the reactor, it is preferred that the feed is heated (preheated) before being introduced into the reactor. The vertical fixed-bed type is preferred in order to easily prevent the concentration distribution of the components due to specific gravity differences. The hfc-134a as a gas phase reaction component can be introduced directly into the reactor at room temperature. When preheating, the hfc-134a is preferably heated to a temperature of 80 to 450 and supplied to the reactor.

From the viewpoint of suppressing side reactions and from the viewpoint of ease of supply of hfc-134a to the reactor and flow rate adjustment, it is also possible to introduce the feed gas containing diluted gas and hfc-134a of vinyl chloride trifluoride into the reactor after preheating, preferably. Preferably, the diluent gas is mixed with hfc-134a for supply, and in the case of the reaction between the gas phase hfc-134a and the solid phase calcium oxide, the feed gas is heated to the above-mentioned temperature and supplied to the reactor. Alternatively, hfc-134a and dilution gas can be supplied to the reactor either by preheating them separately to the above temperature and then mixing them, or by mixing hfc-134a and dilution gas first as the feed gas. hfc-134a and dilution gas can be supplied to the reactor either by mixing them or by heating them to the above temperature and then supplying them separately to the reactor as required.

The above is the manufacturing method and process of vinyl chloride trifluoride, for more information, please feel free to contact us!