摘要:
Mixtures containing high boiling and low boiling components, at least one component being dissociatable into ions, are separated effectively by heating by passing an alternating electrical current through the mixture. The process is particularly effective in the workup of crude alkylchlorosilanes from the direct synthesis.
摘要:
Mixtures containing high boiling and low boiling components, at least one component being dissociatable into ions, are separated effectively by heating by passing an alternating electrical current through the mixture. The process is particularly effective in the workup of crude alkylchlorosilanes from the direct synthesis.
摘要:
Sulfuric acid contaminated with byproducts of chloromethane scrubbing is regenerated for reuse in the scrubbing process by diluting with water to not lower than about a 55 weight percent concentration, heating the diluted acid to boiling at not more than about 135° C., concentrating the acid to a concentration of minimally 80 weight percent at a temperature of at least 170° C., and reacting the concentrated acid with an oxidizing agent.
摘要:
The invention relates to a process for the preparation of chloromethane from methanol and hydrogen chloride contaminated with Si compounds, the Si compounds being methylchlorosilanes, methoxymethylsilanes and hydrolysis and condensation products thereof, in which some of the Si compounds are removed by condensation from the chloromethane formed and remaining Si compounds are washed out with methanol, the methanol thus obtained and containing Si compounds being used for the further preparation of chloromethane with hydrogen chloride.
摘要:
The present invention relates to a method for preparing a polyorganosiloxane, that contains mono- and tetrafunctional units, by hydrolysis and condensation of mixtures of alkyl silicates and alkylsilanes and/or their hydrolyzates and compounds containing SiCl groups.
摘要:
The invention relates to a process for the preparation of chloromethane from methanol and hydrogen chloride contaminated with Si compounds, the Si compounds being methylchlorosilanes, methoxymethylsilanes and hydrolysis and condensation products thereof, in which some of the Si compounds are removed by condensation from the chloromethane formed and remaining Si compounds are washed out with methanol, the methanol thus obtained and containing Si compounds being used for the further preparation of chloromethane with hydrogen chloride.
摘要:
Sulfuric acid contaminated with byproducts of chloromethane scrubbing is regenerated for reuse in the scrubbing process by diluting with water to not lower than about a 55 weight percent concentration, heating the diluted acid to boiling at not more than about 135° C., concentrating the acid to a concentration of minimally 80 weight percent at a temperature of at least 170° C., and reacting the concentrated acid with an oxidizing agent.
摘要:
Cyclic siloxanes are separated from short chain hydroxyl-terminated siloxanes by contact with steam at at least 650 hPa absolute. The cyclic siloxanes and other components which are separated by use of steam can be recovered by phase separation, and preferably used in other processes.
摘要:
Cyclic siloxanes are separated from short chain hydroxyl-terminated siloxanes by contact with steam at at least 650 hPa absolute. The cyclic siloxanes and other components which are separated by use of steam can be recovered by phase separation, and preferably used in other processes.
摘要:
The invention relates to a method for processing mixtures which contain HCl, H2O and siloxanes in the presence of packings comprising fluorinated vinyl polymers.