Process for purifying hydrocarbon streams including heterogeneously and homogeneously catalysed reactions

A process for purifying a hydrocarbon stream containing at least Cx alkanes, Cx olefins, low boilers and high boilers, where x is an integer from 3 to 5, the process comprising:

• a) removing at least a portion of the low boilers from the hydrocarbon stream in a first removal unit to obtain a hydrocarbon stream which has been at least partially freed of low boilers, and separating the hydrocarbon stream which has been at least partially freed of low boilers into two partial streams A1 and A2;
• b) carrying out a heterogeneously catalyzed oligomerization with the partial stream A1 using a nickel-containing catalyst to obtain a reaction mixture A1;
• c) removing an obtained reaction product from the reaction mixture A1 to obtain a hydrocarbon stream A1 from which reaction products from b) have been at least partially removed;
• d) carrying out a homogeneously catalyzed reaction with the partial stream A2 to obtain a reaction mixture A2, wherein the homogeneously catalyzed reaction is a hydroformylation, an alkoxycarbonylation or an epoxidation;
• e) removing an obtained reaction product from the reaction mixture A2 to obtain a hydrocarbon stream A2 from which reaction products from d) have been at least partially removed;
• f) feeding the hydrocarbon stream A1 from c) and the hydrocarbon stream A2 from e) to a hydrogenation to obtain a hydrogenation product;
• g) removing at least a portion of the high boilers from the hydrogenation product from f) in a second removal unit to obtain a purified hydrocarbon stream containing more than 98% by weight of Cx alkanes.