REACTIVE DISTILLATION OF CHLOROSILANES

• Main Authors: HALM, ROLAND, LEE, VAN KOEVERING, DENNIS, GENE, GATTI, CHRISTOPHER, DARREN, GAMMIE, ANDREW, BRUCE, KOZENSKI, CHRISTOPHER, JAMES
• Format: Patent
• Language: English; French
• Published: 05.10.2006
• Subjects: ACYCLIC, CARBOCYCLIC OR HETEROCYCLIC COMPOUNDS CONTAININGELEMENTS OTHER THAN CARBON, HYDROGEN, HALOGEN, OXYGEN, NITROGEN,SULFUR, SELENIUM OR TELLURIUM; CHEMISTRY; CLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION ORPROCESSING OF GOODS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; METALLURGY; ORGANIC CHEMISTRY; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS; TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINSTCLIMATE CHANGE

Chlorosilanes such as dimethyldichlorosilane are hydrolyzed in a first super-azeotropic hydrochloric acid distillation column A to produce cyclosiloxanes, chlorosiloxanes, and hydrogen chloride gas. The cyclosiloxanes and the chlorosiloxanes are washed and separated according to their volatility in a second sub-azeotropic hydrochloric acid distillation column B, to produce a substantially chloride free volatile cyclosiloxane stream and a substantially chloride free non- volatile siloxane stream. The process is substantially chloride efficient. Les chlorosilanes, notamment le diméthyldichlorosilane sont hydrolysés dans une première colonne de distillation d'acide hydrochlorique super-azéotropique A afin de produire des cyclosiloxanes, des chlorosiloxanes, et un gaz de chlorure d'hydrogène. Les cyclosiloxanes et les chlorosiloxanes sont lavés et séparés d'après leur volatilité dans une seconde colonne de distillation d'acide hydrochlorique sub-azéotropique B afin d'obtenir un chlorure sensiblement exempt de courant volatil de cyclosiloxane et un chlorure sensiblement exempt de courant non volatil de siloxane. Le procédé est sensiblement efficace avec du chlorure.