A process for the production of terephthalate diesters having the following formula (I).
Substituents R and R′ are the same or different and represent a straight chain, branched or cyclic aliphatic group, an aromatic group, an alkaryl group or an aralkyl group, each group having from 6 to 20 carbon atoms. The process involves reacting a terephthalate polyester with a high molecular weight alcohol or a mixture of high molecular weight alcohols each having from 6 to 20 carbon atoms, in the presence of a catalyst and recovering the desired compound accoridng to formula (I). This process is particularly useful for recycling scrap terephthalate polyester products such as those produced from polyethylene terephthalate (PET), crystallized polyethylene terephthalate (CPET), glycol-modified polyethylene terephthalate copolyester (PETG), polybutylene terephthalate (PBT), polycyclohexanedimethylene terephthalate (PCT), as well as the acid- and glycol-modified copolyesters of PCT, respectively PCTA and PCTG.
一种生产具有下式 (I) 的
对苯二甲酸二酯的工艺。
取代基 R 和 R′相同或不同,代表直链、支链或环状脂肪族基团、芳香族基团、烷芳基或芳烷基,每个基团具有 6 至 20 个碳原子。该工艺包括在催化剂存在下,使
对苯二甲酸酯聚酯与高分子量醇或高分子量醇混合物反应,每种醇具有 6 至 20 个碳原子,然后回收符合式(I)的所需化合物。该工艺特别适用于回收废
对苯二甲酸酯聚酯产品,例如由聚
对苯二甲酸乙二醇酯(PET)、结晶聚
对苯二甲酸乙二醇酯(
CPET)、
乙二醇改性聚
对苯二甲酸乙二醇酯共聚物(PETG)、聚
对苯二甲酸丁二醇酯(PBT)、聚
对苯二甲酸环己烷二甲酯(
PCT)以及
PCT 的酸和
乙二醇改性共聚物(分别为
PCTA 和
PCTG)生产的产品。