| 摘要 |
<p>Dimethyl-dichlorosilane (I) is made by reaction of methyl chloride over a solid contact mass consisting of (a) silicon and (b) a catalyst consisting of (i) Cu or a Cu cpd. and (ii) 30-1000 ppm of at least one metal chosen from Sn and Sb (calculated as Sn and/or Sb metal), or a cpd. of Sn and/or Sb and between 0.05-2% (calculated as metal) of at least one alkali metal chosen from Li, Na, K and Rb or a cpd. of this alkali metal, w.r.t the solid contact mass of Si + catalyst. - Pref. (i) the content of alkali metal (calculated as alkali metal) =0.1-1 wt.%; (ii) the content of Sn and/or Sb=80-250 ppm; (iii) the alkali metal is chosen from K and Rb; (iv) the catalyst also contains 0.1-3% (calculated as Zn metal) of Zn or a Zn cpd. w.r.t the wt. of solid contact mass; (v) up to 90 wt.% of the Zn may be replaced by a metal which catalyses the chlorination of Cu and/or which forms a eutectic or a low m.pt. phase with salts of Cu and/or alkali metals; (vi) the catalyst is chosen from Cu, cuprous chloride and cupric chloride; (vii)the content of Zn=0.2-1 wt.%.</p> |
