Hydrogenolysis catalyst based on nickel and barium - to obtain ethylene glycol mono-alkyl ether(s) from corresp. polyglycol cpds.

摘要

Catalyst is used in the mfr. of ethyleneglycol monoalkyl ethers, ethers of di-, tri- and poly-glycols are formed as undesirable by-products; the above enables their conversion in high yields (80-100%). The poly-glycol ethers are pref. of formula R(OCH2CH2)xOH in which R is 1-5C alkyl and x is 2-4. The pref. catalyst contains 20-30% Ni and 0.5-5% Ba. It also pref. contains a transition element, esp. Mn or Cr, in amt. up to 5%. Diethyleneglycol monoethel ether is passed at a specific hourly rate of 0.75/hr. with H2 (67 1/hr) through a catalyst (200 ccs) contg. 22.3% Ni, 3.7% Ba CO3, 64% kieselguhr and 10% kaolin in a 26.5 mm dia. reactor at 250 degrees C and at 100 bars pressure. The prod. contains 63% ethyleneglycol monoethyl ether at a yield of 94%.