SU1411011A1 - Method of regeneration of monoethanolamine solution saturated with carbon dioxide - Google Patents

Abstract

This invention relates to the recovery of mono-ethio solutions. (IEA). saturated with yr.jcpo / ia dioxide. and can be used in the xiiMHMCc and petrochemical industries / juvenile. To ensure the reduction of energy consumption, the process is conducted at the same velocity of the vapor-gas mixture in the living section at all contact stages and the residence time of the solution in the regenerator, which is determined according to the formula t (pas. / S) / K. i.ic t - the residence time of the solution in the regenerator, s; en is the degree of carbonization of the saturated solution, mol CO СО / mol LLEL; ctp is the carbonization wall of the regenerated solution, mol CO2 / mol. The energy costs are reduced by 10%. (O

Description

The invention relates to methods for the regeneration of carbon dioxide-saturated aqueous solutions of monoethanolamine (MEA) and can be used in the chemical, petrochemical and food industries.

The purpose of the invention is to increase the efficiency of the process by reducing energy consumption and increasing the degree of regeneration.

Example. A water saturated CO2 solution of MEA with a "0.49 mol CO2 / mol MEA I is heated in recuperative heat exchangers to 90 ° C and heated in a countercurrent 1-tray regenerator with a diameter of 3.0 m, having 16 strainer plates with an organized liquid phase overflow. In the regenerator, a saturated CO-2 solution of MEA boils and at the same time is repaired. The velocity of the gas-vapor mixture in the living section of each contact stage is maintained the same: by decreasing the living cross section of the plates in the upward direction by 2 times (lower tray 10%, upper 5%) and is 0.5-0.6 m / s .

Pure G, O2 goes through the top of the regenerator. A regenerated solution of MEA with a carbonization degree of 0.16 mol of CO2 / mol of MEA from the bottom of the regenerator through {junction heat exchangers returns to the cycle of the gas cleaning unit for acidic components. The flow rate of the solution is 320 m / h, the heat consumption is 1,400 kcal / kg P02. The concentration of MEA in the solution is 16%. (Contact time t is 110 s and is calculated by the formula

with

„“ “OK .17

TO.

Where Ke is 0.011 / s with a constant velocity of the vapor-gas mixture in the live-sepia contact stages, equal to 0.55 m / s.

0

five

0

five

Improving the efficiency of the process by maintaining the constant velocity of the gas-vapor mixture in the living section of the contact stage and the reasonable residence time of the solution leads to a decrease in the specific heat consumption from values exceeding 2000 kcal / kg CO2 at carbonation degrees 0.45-0.5 mol CO2 / mole of MEA, to values of the order of 1300 kcal / kg C02. The actual heat consumption for the regeneration process is reduced by 10%.

Claims (1)

Invention Formula The method of regenerating carbon dioxide saturated monoethanolamine solution - the process of gas purification from acidic components by its multi-stage contact with the gas-vapor mixture at 90-120 ° C in countercurrent apparatus, characterized in that, in order to increase the efficiency of the process by reducing energy costs, the process is conducted at ; 1 keeping the constant velocity of the gas-vapor mixture in the living section of the dish at all contact stages and the total residence time of the solution in the apparatus, determined by the formula Ka de t is the total residence time of the solution S regenerator, s; ai is the degree of carbonization of the saturated solution, mol CO per mole of monoethanolamine; ap is the degree of carbonization of the regenerated solution, mol C02 per. mole of monoethanolamine; Ke is an effective rate constant for decomposition when regenerating CO compounds; with monoethylamine, 1 / s.