SU1399267A1 - Method of producing zinc monofluorophosphate - Google Patents

Abstract

This invention relates to a process for the preparation of metal monofluorophosphates used for the production of metal corrosion inhibitors. The purpose of the invention is to improve the quality while increasing the yield of the final product. The goal is achieved according to the method of producing zinc monofluorophosphate, which consists in reacting sodium monofluorophosphate in an aqueous medium at room temperature, taken with an excess of 2-5% by weight to stoichiometry with a solution of zinc sulfate, followed by osazvde. using organic salting out in the medium, in which acetone or ethyl alcohol is used, which is taken in a ratio of (0.7: 1): 1 to the volume of solutions of the starting materials with further washing and drying of the resulting product. The product yield of 99.3%. y / Purity 99.2-99.5%. 1 tab.

Description

the stoichiometric ratio, exchange rate is carried out at 18 C.

This invention relates to a process for the preparation of metal monofluorophosphates used for the production of metal corrosion inhibitors.

The purpose of the invention is an increase in pure product and yield.

PRI me R 1. Take 66.5 ml of a 0.2M solution of zinc sulfate, which corresponds to 3.82 g of ZnSO. and 68.5 ml of 0.2 M sodium monofluorophosphate solution, which corresponds to 1.98 g, i.e. in 3.5% excess to

React- As a vysalivatel, 94.5 ml of acetone is used, which corresponds to the ratio of the volume of acetone to the total volume of the starting material solution equal to O, 7: 1.

As a result of the exchange reaction, zinc monofluorophosphate hydrate crystals, 5Н20, are precipitated, which are washed by decantation in a minimum amount of distilled water and acetone until there are no 507 ions in industrial liquid and dried in air. The yield of the finished product is 2.75 g, i.e. 99.3 wt.% From theory

chesky amount.30

The remaining examples are similar to the first one and differ in composition by the ratio of the initial components, the conditions of the process and are tabulated for comparison; The data on the preparation of ZnPOjF-2,5lLO with the use of ammonium monofluorophosphate as the initial component are given here. (NH).

Claims (2)

1. A method of producing monofluorophosphate of zinc by reacting monovalent single-bed cations with zinc sulfate in an aqueous medium of monofluorophosphates with subsequent precipitation, filtration, washing and drying of the product obtained, in order to increase the purity and yield of the product. Sodium monofluorophosphate with an excess of 2–5% is used as a monovalent cate monofluorophosphate. to stoichiometry, and the precipitation is carried out in an organic vysalivatel - acetone or ethyl alcohol at a ratio vysaliver: the volume of initial solutions t, 0, 7-1): I. 2. Method pop. 1, I differ by the fact that the solution monoftor 35 As can be seen from the table, the optimum until sodium phosphate is added to the solution are the following process parameters: zinc sulfate. sodium monofluorophosphate; the ratio of POjFrZn is 1.02: 1.05: 1; concentration of solutions of initial reagents (for zinc sulphate solution, equal to O, M, for sodium monofluorophosphate solution 0.2-0.4 M order of mixing of initial reagents (adding sodium monofluorophosphate solution to zinc sulphate solution1; extractor (acetone, ethyl alcohol); the ratio of the volume of the salting out to the volume of the solutions of the initial substances, equal to (0.7–1): 1, allows to achieve a high yield (98.9–99.3) and purity (99–99.37%) of the product obtained. The method allows to increase the product yield up to 99.3%. 20 claims 0 1. A method of producing zinc monofluorophosphate by reacting monovalent cations with zinc sulfate in an aqueous medium of monofluorophosphates followed by precipitation, filtration, washing and drying of the product obtained, in order to increase the purity and yield of the product. As monovalent cation monofluorophosphate sodium monofluorophosphate is used with an excess of 2-5%. to stoichiometry, and the precipitation is carried out in an organic vysalivatel - acetone or ethyl alcohol at a ratio vysaliver: the volume of initial solutions t, 0, 7-1): I. 2. Method pop. 1, I differ by the fact that the solution is monofluor5 ABOUT) & U U to  S N f o o Rm - AND oh oh  td 00 CTi o see cm go 1M Attv "N CM o rg r Cs) Rch d pm f yi g d cl with N)