Preparation method of lactate

A lactic acid ester and lactic acid technology, which is applied in the field of coupling technology using a membrane process to integrate lactic acid esterification reaction, to achieve the effects of reducing content, increasing conversion rate, and reducing mass transfer resistance

Active Publication Date: 2007-10-03
NANJING UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0005] The technical problem to be solved by the present invention is to provide a method for preparing lactate with high conversion rate, low energy consumption, short reaction time and no pollution in order to improve some deficiencies in the existing lactate preparation method

Method used

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  • Preparation method of lactate

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Experimental program
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Effect test

Embodiment 1

[0021] Connect the membrane, components and related equipment as shown in Figure 1. The porous membrane used is a single-tube alumina ceramic membrane with a pore size of 20nm; the dense membrane used is a NaY single-tube molecular sieve permeable membrane. Add 350 grams of 99% methanol, 10 grams of FeCl to a 2000 ml reactor 3 , turn on the magnetic stirrer to stir, and use a water bath to heat through the jacket to 65 °C and then keep the temperature constant; start the circulating water vacuum pump to vacuum the submerged pervaporation device, slowly open the regulating valve 4, the gauge pressure of the vacuum pump is 30kPa; open the regulating valve 1, The operating pressure is 600kPa, so that 80% lactic acid permeates the ceramic membrane 4 at a flow rate of 10 grams per minute (the equivalent permeation flow rate is 100L·m -2 h -1 ); after completion of the reaction, accumulatively add 1125 grams of lactic acid, and pervaporate 394 grams of water passing through the mol...

Embodiment 2

[0023] Connect the membrane, components and related equipment as shown in Figure 1. The porous membrane used is a multi-channel zirconia ceramic membrane with a pore size of 200nm; the dense membrane used is a NaA single-tube molecular sieve permeable membrane. Add 700 grams of 95% ethanol, 9 grams of AlCl in a 2000 ml reaction kettle 3 , turn on the magnetic stirrer to stir, and use a water bath to heat through the jacket to 75°C and then keep the temperature constant; start the circulating water vacuum pump to vacuum the submerged pervaporation device, slowly open the regulating valve 4, the gauge pressure of the vacuum pump is 15kPa; open the regulating valve 1, The operating pressure is 300kPa, so that 80% lactic acid permeates the ceramic membrane 4 at a flow rate of 80 grams per minute (equivalent permeation flow rate 4500L·m -2 h -1 ); after completion of the reaction, accumulatively add 1125 grams of lactic acid, and pervaporate 400 grams of water passing through the ...

Embodiment 3

[0025] Connect the porous membrane, components and related equipment as shown in Figure 1. The dense membrane adopts an external circulation pervaporation dehydration device. The porous membrane used is a flat alumina ceramic membrane with a pore size of 500nm; the dense membrane used is a macromolecule Permeable membrane. Add 800 grams of 99% n-propanol and 20 grams of cation exchange resin into a 2000 ml reaction kettle, turn on the magnetic stirrer to stir, and use a water bath to heat to 70°C through the jacket and then keep the temperature; start the circulating water vacuum pump to circulate pervaporation The device is vacuumed, and the regulating valve 4 is slowly opened, and the gauge pressure of the vacuum pump is 10kPa; the regulating valve 1 is opened, and the operating pressure is 50kPa, so that 80% lactic acid permeates the ceramic membrane 4 at a flow rate of 40 grams per minute (equivalent permeation flow rate 2000L· m -2 h -1 ); after completion of the reacti...

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Abstract

This invention relates to a kind esterification reaction technology of lactic acid, above all refer a coupling technology of adopting membrane course to integrate lactic acid esterification reaction. It takes lactic acid and alcohol as raw material. adding catalyzer and alcohol in reactor, adopting pressure actuated device to pressurize lactic acid, make lactic acid permeate porous membrane diverting device and enter liquid in reactor; heat reaction, at the same time adopt dehydration plant to deprive water from system; while reaction completed, adopt reduced pressure distillation method to separate mixed liquor of reaction which mostly contain lactic acid, alcohol, lactate as well as ounce water, to obtain high-purity lactate, and the rest materials for periodic duty. This invention solves a good many problems about low transformation efficiency, high dissipation of energy, equipment erosion and environmental pollution in existing esterification reaction craft.

Description

technical field [0001] The invention relates to a lactic acid esterification reaction technology, in particular to a coupling technology for integrating a lactic acid esterification reaction using a membrane process. Background technique [0002] Lactate is an important spice and industrial solvent, and is widely used in food, medicine, paint, electronics and other departments. For example, ethyl lactate, because of its non-toxic, good solubility, non-volatile, biodegradable and other characteristics, is considered to be a "green solvent" with great application prospects, which can replace some toxic solvents that are currently widely used in industry. Solvents (such as halogenated hydrocarbons, aromatic hydrocarbons, ketones, etc.), in today's world with highly developed industries and increasingly prominent environmental protection issues, their research and application are of great significance. [0003] The synthesis of lactate generally includes two methods: direct est...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C07C67/08C07C69/68
Inventor 徐南平李卫星邢卫红
Owner NANJING UNIV OF TECH
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