English to Russian Law/Patents Chemistry; Chem Sci/Eng Получение синтетических сложных эфиров

In the description of the Polish Patent No. 141736, a method is disclosed that is applied to produce a methyl ester of ε-hydroxycaproic acid; according to this method an aqueous solution, formed during the washing of a raw product of cyclohexane oxidation process with water, is compressed at atmospheric pressure; next, it is again compressed at a pressure of 3 to 30 kPa, and, thereafter, it is esterified at, for example, an increased pressure during a liquid phase with the use of excess methanol. The subsequent process step is to distillate the esterified mixture produced at a decreased pressure. The distillation result is a ε-hydroxycaproic acid methyl ester and bi-methyl esters of butanedioic (succinic), glutaric, and adypic acids, all of which are applied as raw materials for further processing, in particular for producing synthetic fibres.

Понятно, что раствор подвергают воздействия давления. Но не сжимают же его. Концентрируют (хотя не обнаружил такого перевода для данного термина) или сгущают?
Спасибо!