General description

The main purpose of the methanol regeneration unit is to restore high-concentration methanol (95% mass) from the water-methanol mixture.

Methanol is mainly used fir hydrate inhibition. Its low ice formation temperature allows methanol to be used in a wide range of temperatures and pressures.

Growing methanol prices make regeneration process economically efficient even in small scale.

Key benefits

  • Skid mounted design.
  • High efficient 3-pase separator in standard design. Modern coalescing elements provide efficient phase separation resulting low hydrocarbon pollution of the methanol.
  • Build in solutions for scale prevention.
  • Separate weir section for HC accumulation with automatic level control.
  • Stainless steel condenser tubes and distillation trays.
  • 87% heat efficiency (with forced draft burners).
  • Quick opening closures for filter replacement.

Pic. 1 Methanol regeneration unit 3-D model

Pic. 2 Methanol regeneration unit DWG

Pic. 3 Methanol regeneration unit Flow diagram

Process description

Rich methanol through the pre-heat heat exchanger (1) flows to the 3-phase separator (2) where light gaseous HC and condensate fractions are separated from water-methanol mixture.

From 3-phase separator rich methanol is level controlled to the heat exchanger (5) flowing through bag (3) and charcoal (4) filters.

Being heated by the stripped water from the reboiler in the heat exchanger (5) rich methanol enters regeneration tower (6).

Heat required for the regeneration process is supplied form the reboiler by direct fired heater, steam of thermo electric element. Condenser (8) provides the reflux stream

Reflux pumps (6) return methanol back to tower while the balance of the methanol stream is pumped toe the lean methanol storage.

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There is a demand for effective ways to treat both associated petroleum gas, common at oil production sites as well as gas condensate produced alongside natural gas at gas condensate fields. This demand is boosted by several reasons: growth in oil and gas production, tightening of the ecological norms and emission standards, gradual decline in dry Cenoman gas deposits and a consequent shift to development of new gas condensate fields.


Let’s analyze potential gas-processing options for a small oil company. It is extracting up to 120 mln scm of associated petroleum gas per year. Currently the gas is flared.

A gas pipeline of intermediate pressure (3.5 Mpa) passes 10 km away from the oil treatment unit, where oil and gas are separated. Technical specs for adding the gas to the pipeline are as follows: -10°С dew point for water, -5°С dew point for hydrocarbons. Company’s oilfield can be reached by wheeled transport by road.

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