Translation of "Tetrachlorethen" in English

Typically, trichloroethylene and tetrachloroethylene are collected together and then separated by distillation.

Or, if we're lucky, he still intends to. Tetrachloroethylene.

Trichloroethene or tetrachloroethene is fed to the installation via the reservoir vessel (5).

The estrogen you've been injecting contains tetrachloroethane.

Nearly 90 % of Tetrachloroethylene could be removed from the aquifer.

Wheras, on the basis of the criteria laid down in Directive 76/464/EEC, 1-2-dichloroethane, trichloroethylene, perchloroethylene and trichlorobenzene should be made subject to the provisions of Directive 86/280/EEC,

This reaction produces tetrachloroethylene as a byproduct, and depending on the amount of chlorine fed to the reaction, tetrachloroethylene can even be the major product.

The Council adopted this Directive on 27 July.2Its purpose is to limit or eliminate the pollution of the aquatic environment by four dangerous substances, namely 1-2-dichloroethane, trichloroethylene, perchloroethylene and trichlorobenzene, laying down limit values and quality objectives for discharges of these substances into the aquatic environment.

A 150×200 mm injection-moulded sheet of polyethylene terephthalate is activated at room temperature for 30 seconds in an activation bath made up from 0.4 g of mesityl oxide-platinum complex and 650 ml of tetrachloroethene, dried at room temperature and then nickeled according to Example 1.

Therefore, one has earlier used for the cleaning of metallic workpieces chlorinated hydrocarbons, for example tetrachlorethen (Per) or trichlorethen (Tri) which were considered to be ideal cleaning agents, in particular for the removal of grease and pigment dirt whereas their negative properties with respect to environmental questions became known only later and were only later taken into account.

Under the aspect of environmental questions many countries have in the meantime adopted legislation aiming at the reduction or the prohibition of chlorinated hydrocarbons, in particular tetrachlorethen and trichlorethen as well as halogenated hydrocarbons.

Examples of organic nonreactive solvents which can be used concomitantly in the preparation of the compositions of this invention in order to impart to the compositions a sufficiently low viscosity for processing are aliphatic, aromatic and chlorinated hydrocarbons such as petroleum ethers, white spirits, toluene, xylene, trichloroethene and tetrachloroethene.

To prevent side reactions, for example by further oxidation of the acid chloride or epoxide formed, the reaction mixture is passed in circulation and a constant acid chloride content is established in the reaction mixture by removing 10 to 20% per hour and by adding fresh trichloroethene or tetrachloroethene.

However, the crude acid chloride can be further processed directly, for example to the esters, which can be separated more easily from the tetrachloroethene.

In the conversion of trichloroethene and tetrachloroethene into dichloroacetyl chloride (DAC) or trichloroacetyl chloride (TAC) by means of oxygen, the reaction mixture is passed several times as a thin film through the reaction zone.

A process for the continuous preparation of dichloro- or trichloroacetyl chloride by reaction of trichloroethene or tetrachloroethene with oxygen in the liquid phase under irradiation with light of short wavelength at a temperature of 70 to 140° C. under a pressure of 1 to 20 bar, which comprises passing the starting substance in a thin film through the reaction zone, letting off the waste gas periodically at a frequency such that the pressure variations in the apparatus do not exceed about 10% and keeping the oxygen essentially under static pressure.

A process according to claim 4, wherein the halogenated hydrocarbons are selected from the group consisting of trichloroethene, tetrachloroethene, 1,2,3-trichloropropane, chloroform and 1,3-dichlorobenzene.

The invention thus relates to a process for the continuous preparation of dichloro- or trichloroacetyl chloride by reaction of trichloroethene or tetrachloroethene with oxygen in the liquid phase under irradiation with light of short wavelength at a temperature of 70 to 140° C. under a pressure of 1 to 20 bar, which comprises passing the starting substance in a thin film through the reaction zone, letting off the waste gas periodically at a frequency such that the pressure variations in the apparatus do not exceed about 10% and keeping the oxygen essentially under static pressure.

The increase of Cl ? ions in solution (26 mmol) corresponds to a tetrachloroethene conversion of 91%.

As organic solvent for the polyester carbonate solution to be washed, those solvents are used that dissolve the relevant polycarbonate and form with water a two-phase synthesis mixture, such as aliphatic, optionally branched, partially or totally halogenated solvents containing 1 to 10 carbon atoms, chlorine or fluorine being used as halogen, such as methylene chloride, trichloroethane, tetrachloroethane, and also aromatic, optionally substituted compounds containing 6 to 18 carbon atoms such as benzene, toluene, o/m/p-xylene, methoxybenzene or ethoxybenzene, diphenyl, diphenyl ether, chlorobenzene, o/m/p-dichlorobenzene, as well as mixtures thereof.

1,631 g of tetrachloroethene were oxidized analogously to Example 1 at 110° C. under a pressure of 1.75 bar in a falling film photoreactor.

The four 'drins' (aldrin, dieldrin, endrin and isodrin), hexachlorobenzene, hexachlorobutadiene and chloroform were added by Council Directive 88/347/EEC, and 1,2dichloroethane, trichloroethylene, perchloroethylene and trichlorobenzene were added by Council Directive 90/415/EEC.

Suitable solvents are, for example, hydrocarbons, ethers in general, such as diethyl ether, 1,2-dimethoxyethane, tetrahydrofuran or dioxane, or acetonitrile, butyronitrile, dimethylformamide, dimethylacetamide, acetone, 4-methyl-2-pentanone, methylene chloride, chloroform, dimethyl sulfoxide, anisole, chlorobenzene or tetrachloroethylene, or mixtures of these solvents.