SU570583A1 - Method of separating propylene from products of propylene epoxidizing by ethyl benzol hydroperoxide - Google Patents

Description

Table 1

the regeneration of the extractant is carried out only; b) the extraction of all propylene and its condensation, as well as the extraction of the extractor in the second column and its condensation, is carried out at a temperature above + 12 ° C, which eliminates the formation of crystalline hydrates and simplifies the process technology.

The number of plates in the columns given in the examples and the reflux numbers are not critical, since other combinations of these values can be used.

Example 1. An epoxidation product in the amount of 68.7 kg / h is fed to an extractive distillation column. The isobutane feed rate is 6.52 kg / h.

Distil t extractive distillation columns (propylene mixed with isobutane)

return to epoxidation. The column, containing 10 theoretical contact stages, operates under a pressure of 9.3 at, at a cube temperature of 135 ° C and a top temperature

+ 23.5 ° C, reflux ratio of 1.32. The weight of the distillate is 12.27 kg / h. Distillation of the colonies of the regeneration of the extractant (isobutane mixed with propylene and propylene oxide) is pumped into the power of the extractive column.

rectification. The regeneration column, containing 16 theoretical stages of contact, operates under a pressure of 2.6 at a cube temperature of 135 ° C, the top is f 17.5 ° C, and the reflux ratio is 1.31. The weight of distillate and extractant recovery column is 6.87 kg / h.

In tab. Figure 1 shows the composition of the streams, feedstock and excretion products.

table 2

Example 2. An epoxidation product in the amount of 68.7 kg / h is fed to an extractive distillation column. The supply of β-butane is 8.9 kg / h.

The distillate of the extractive distillation column (propylene mixed with n-butane) is returned to the enoxidation. The column, containing 8 theoretical contact stages, operates under a pressure of 9.3 at, at a cube temperature of 135 ° C, a top temperature of + 24 ° C, and a reflux number of 1.12. The weight of the distillate is 12.27 kg / h. The distillate of the extractor recovery column (n-butane mixed with propylene and propylene oxide) is pumped into the power supply of the extractive distillation column. The extractant regeneration column, containing 23 theoretical contact stages, operates under a pressure of 2.6 at a cube temperature of 135 ° C, top +26 ° C, and a reflux ratio of 1.7. The weight of the distillate is 9.25 kg / h.

In tab. 2 shows the composition of the streams, feedstock and excretion products.

Claims (2)

1. The patent of Germany No. 1960857, cl. 12O 19/01, 1971. 20 2. US patent No. 3632482, cl. 203-56, 1972.