Patent ID: 6906234

Claim:
Continuous method for enrichment of reaction mixtures of unconverted parent substances, a target product, and by-products, the reaction mixtures comprising a concentration of at least 0.1 w/w % resulting from the catalytic metathesis of cycloalkanedienes from mixtures of cyclic aliphatic alkenes and cyclooligomers in a liquid organic reaction media, wherein said media is an aliphatic, cyclic aliphatic or chlorinated hydrocarbon, in which the liquid organic reaction media and the unconverted part of parent substances are recycled, for the use as heat transfer medium at a temperature difference of 5 K at least (T 1 /T 2 ) evaporated and compressed, and finally are fed in condensed state to a mixing vessel for adjusting the concentration ratios of parent substances, said method comprising the steps of: (a) continuously withdrawing a low-concentrated reaction mixture from a reactor and feeding said mixture into a single or multiple chambered evaporator at temperature T 1 ; (b) sucking vapors of the organic reaction medium from the evaporator; (c) compressing said vapors in a vent compressor by means of electrical energy; (d) feeding back said compressed vapors at temperature T 2 into a heat exchanger of the evaporator; (e) performing heat exchange in the evaporator between the low-concentrated reaction mixture at temperature T 1 and the compressed organic reaction medium at temperature T 2 , (f) continuously feeding back condensed organic reaction medium from the heat exchanger of the evaporator into a mixing vessel for adjusting the method determined concentration ratios; and (g) continouously withdrawing reaction medium enriched with reaction mixture to a content of at least 30 w/w % from the evaporator, wherein said reaction medium comprises target product, by-products, parent substances and organic reaction medium.