Abstract: The invention relates to a process for the preparation of dichloroacetyl chloride by oxidation of trichloroethylene under pressure and at elevated temperature in the presence of a certain secondary aliphatic or cycloaliphatic amine of the formula HNR.sup.1 R.sup.2 in which R.sup.1 and R.sup.2 are identical or different and are an alkyl radical having 1 to 10 carbon atoms, where at least one of the radicals R.sup.1 and R.sup.2 has a tertiary structure, or R.sup.1 and R.sup.2 together with the nitrogen atom form a 5- to 10-membered ring, where at least one of the carbon atoms adjacent to the nitrogen is a tertiary carbon atom. Good yields of the acid chloride and low trichloroethylene oxide contents are obtained in one process step.

Abstract: The disclosure relates to a process for removing heavy metal ions and arsenic from wet-processed phosphoric acid, wherein the crude wet-processed phosphoric acid is treated at temperatures between 10.degree. and 100.degree. C. initially with a diorganyldithiosphosphoric acid ester and then with an adsorbent, and the phoshoric acid so purified is separated from the ester and adsorbent. More particularly, the wet-processed phosphoric acid is treated with the diorganyldithiophosphoric acid ester at temperatures higher than 50.degree. C. and with the adsorbent at temperatures lower than 50.degree. C.