57 results about "Pentavalent Antimony" patented technology

A process for producing 1,1,1-trifluoroethane (HFC- 143a) which process comprises reacting hydrogen fluoride with vinylidene chloride along with one or more of 1,1,-dichloro-l-fluoroethane (HCFC-141b), l-chloro-l,l-difluoroethane (HCFC-142b) and 1,1,1-trichloroethane (HCC-140a) in the presence of pentavalent antimony as a fluorination catalyst under conditions to produce 1,1,1-trifluoroethane (HFC- 143a), generally in yields of 90% or more.

A process is disclosed for the manufacture of CHClF2which involves contacting CHCl3, HF and pentavalent antimony catalyst in the liquid phase; passing reactor vapor effluent to a reflux column to produce a reflux column vapor effluent of CHClF2 and HCl; passing the reflux column vapor effluent to a condenser to produce a condenser liquid effluent of CHClF2 and a condenser vapor effluent of CHClF2 and HCl; passing the condenser liquid effluent to the reflux column upper end; and recovering CHClF2 from the condenser vapor effluent. The concentration of CHCl2F and CHF3 in the condenser vapor effluent is controlled by: (i) controlling the temperature at a point within the lower third of the theoretical stages of the reflux column by controlling the heat input to the reactor liquid phase; (ii) controlling the pressure in the reactor, reflux column and condenser by controlling the rate at which the condenser vapor effluent is removed from the condenser; (iii) maintaining the reflux ratio of the condenser at a substantially constant value; and (iv) maintaining the reactor liquid phase at substantially the maximum mass that does not result in entrainment or flooding of the reflux column. Also disclosed is CHClF2 which is a product of this process. Also disclosed is a refrigerant comprising CHClF2 and a method for its manufacture, a polymer foam blowing blend comprising CHClF2 and a method for its manufacture, fluoromonomers tetrafluoroethylene and hexafluoropropylene produced by using CHClF2 and a method for their manufacture, and a fluoropolymer produced by using CHClF2 as a fluoromonomer precursor and a method for its manufacture; all involving the manufacture of CHClF2 in accordance with the above process.

The preparation of chlorinated hydrocarbons, such as pentachloropropanes, such as 1,1,1,2,3-pentachloropropane, from tetrachloropropanes, such as 1,1,1,3-tetrachloropropane, in the presence of a polyvalent antimony compound that includes a pentavalent antimony compound, such as antimony pentachloride, is described. Also described are methods for preparing optionally chlorinated alkenes, such as, tetrachloropropenes, from chlorinated alkanes, such as pentachloropropanes, in the presence of polyvalent antimony compound that includes a pentavalent antimony compound, as well as methods for recovering polyvalent antimony compounds from such processes.

The invention discloses a method for removing pentavalent antimony pollutant in water through an electrochemical method, and belongs to the technical field of water treatment. The method comprises the following steps: in an electrochemical reactor, serving an iron electrode as a positive electrode and serving a copper plate or a nickel plate as a negative electrode; adjusting a potential of hydrogen (pH) value of the to-be-processed water containing the pentavalent antimony pollutant to be 3-7, introducing the to-be-processed water into the electrochemical reactor, and adjusting the current density to be 10-30 amperes per square meter, the area of electrode plates and the size of the to-be-processed water to be 0.5-1 square meters / cubic meters, a space distance of the electrode plates to be 1-8cm, and electrochemical treatment time to be 10-40 minutes; and adopting a direct current power supply to supply power. The electrochemical method not only can effectively remove pentavalent antimony pollutant, but also can remove trivalent antimony pollutant.

A method for preparing a bimetallic MOF based on MOF‑808 and its application, which belong to a method for preparing a bimetallic MOF and its application to removing trivalent antimonate and pentavalent antimonate in water. The invention aims to solve the technical problems of low adsorption capacity of trivalent antimony and pentavalent antimony and poor reusability of existing adsorption materials. The present invention provides based on the synthesis conditions of MOF-808, adding different proportions of iron ions to form an adsorption material through in-situ doping, and using it to adsorb and remove trivalent antimonate and pentavalent antimonate in water, and to trivalent antimonate and pentavalent antimonate The maximum adsorption capacity of pentavalent antimonate is 310mg / g and 524mg / g respectively. The material has excellent repeatability. After repeating the adsorption experiment four times, the removal rate of trivalent antimonate with an initial concentration of 100mg / L can still be as high as 90%, and the removal rate of pentavalent antimonate with an initial concentration of 100mg / L The rate can still be as high as 100%.

The invention discloses a method for separating antimony in a hydrochloric acid-chlorine salt solution, comprising: adding an oxidizing agent to the hydrochloric acid-chlorine salt solution, controlling the reaction conditions, oxidizing trivalent antimony in the solution to pentavalent antimony, and making the pentavalent antimony Antimony is precipitated to precipitate pentavalent antimony oxides, thereby obtaining pentavalent antimony oxide precipitation slurry; aging the pentavalent antimony oxide precipitation slurry to allow the pentavalent antimony oxide crystals to grow, and then solidifying Liquid separation, so as to obtain the pentavalent antimony oxide solid and the solution after antimony removal, that is, to realize the separation of antimony. The invention not only can efficiently and selectively separate antimony and has a high recovery rate of antimony, but also has simple technological process and easy operation.