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Method for the preparation of phytosterols from tall oil pitch

a phytosterol and oil pitch technology, applied in the field of phytosterol preparation from tall oil pitch, can solve the problems of cumbersome procedures, complex solvent recovery systems, and complex adjustment of precise solvent compositions to maintain optimal operation for each processing stag

Inactive Publication Date: 2005-05-19
WONG ALFRED +2
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The adjustment of precise solvent compositions to maintain optimal operation for each processing stage is complex.
The procedure is cumbersome as it involves several solvent extraction steps with different polar and non-polar solvents.
The solvent recovery systems for at least polar and non-polar solvents are complex.

Method used

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  • Method for the preparation of phytosterols from tall oil pitch

Examples

Experimental program
Comparison scheme
Effect test

example 1

[0033] 9,598 kg of tall oil pitch were saponified with 1,325 kg NaOH at 12.0% concentration solution, at 146 deg. C. for 120 minutes, under vigorous mixing conditions. The weight ratio of sodium hydroxide (dry basis) to tall oil pitch was 0.138. The reacted mixture was then neutralized with 1,188 kg of 85% concentration phosphoric acid. After continued heating at 146 deg. C. and gentle stirring for 210 minutes, 6,600 kg of water was drawn off from the bottom of the reactor. The pH of the reactor bottom water was 6.4. The partially dewatered mixture containing about 37.5% water was transferred to a second reactor for vacuum stripping of residual moisture. The vacuum reactor was operated at 149 deg. C. at an average pressure of 300 mm Hg. The reaction was completed in 300 minutes. The dried, saponified and neutralized tall oil pitch had a moisture content of 0.4% by wt.

[0034] Table 1 summarizes the percentage of phytosterols present in free form at various stages in the procedure.

T...

example 2

[0036] A sample of tall oil pitch was saponified, neutralized and dewatered by the method described in Example 1. The modified tall oil pitch was found to have a composition of 141 mg free phytosterols / g and 164 mg total phytosterols / g. The modified tall oil pitch was preheated to about 100 deg. C. for feeding into a series of 0.1 square meter wiped evaporators (manufactured by UIC GmbH, Germany). The distillate from each evaporation stage was recovered for the analysis of free phytosterols by gas-liquid chromatography (GLC).

[0037] Table 2 summarizes free phytosterol production results for four tests runs (A1, A2, A3 and A4) under differing conditions of feed rate, temperature and pressure.

TABLE 2Test NumberA1A2A3A4Stage 1 EvaporationTall oil pitch feed, kg / hr15.515.611.515.6Temperature, deg. C.225225225220Pressure, mbar5.946.536.452.08Distillate yield, % by wt.1.90Free phytosterols in Stage 118181818distillate, mg / gStage 2 EvaporationFeed from above Stage 1 residue,15.615.611.51...

example 3

[0038] Samples of Stage 2 distillate from Example 2 were crystallized in laboratory jar tests by heating the distillate-solvent mixture to 65 deg. C. The mixtures were cooled to 30 to 35 deg. C. to yield a slurry containing the desired phytosterol crystals. The weight ratio of organic solvent to distillate was 15:1.0. The cooled slurry was then filtered through 50 micrometer filter paper, under vacuum. The filtered cake was then washed twice with solvent in an amount equal to 1.5 times the weight of distillate sample used for crystallization. The wash solvent had the same composition as that used for crystallization. Washing of the cake was conducted at ambient temperature. The washed cake was then dried at 90 deg. C. for 60 minutes prior to weighing and GLC analysis.

[0039] Table 3 comparatively summarizes crystal purities and crystal yields for test runs A1, A2, A3 and A4, firstly, utilizing methanol as the solvent and, secondly, utilizing a mixture of methanol and 2-propanol as t...

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Abstract

A method of preparing phytosterols from tall oil pitch containing steryl esters comprises the steps of converting the steryl esters to free phytosterols while in the pitch to produce a modified pitch containing the free phytosterols; removing light ends from the modified pitch by evaporation to produce a bottom fraction containing the free phytosterols; evaporating the bottom fraction to produce a light phase distillate containing the free phytosterols; dissolving the light phase distillate in a solvent comprising an alcohol to produce a solution containing the free phytosterols; cooling the solution to produce a slurry with the free phytosterols crystallized in the slurry; and, washing and filtering the slurry to isolate the crystallized phytosterols.

Description

FIELD OF THE INVENTION [0001] The present invention relates to a method of preparing phytosterols from tall oil pitch, including the use of distillation techniques to isolate a phytosterol concentrate that can by crystallization yield high purity phytosterols using a solvent comprising alcohol or a combination of alcohols, and that may include water. BACKGROUND TO THE INVENTION [0002] Tall oil pitch is obtained from the black liquor of alkaline digestion of coniferous wood, most notably the kraft process. The black liquor is typically concentrated and settled to yield soap skimmings that contain sodium salts of fatty acids, sodium salts of resin acids and unsaponifiables. The latter group of substances include fatty alcohols, free sterols, steryl esters, and fatty acid esters. In kraft pulp mills, the collected soap is routinely acidulated with a mineral acid such as sulphuric acid to yield an oil phase and a water phase. The oil phase contains free fatty acids, resin acids and unsa...

Claims

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Application Information

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IPC IPC(8): C07J9/00C11B13/00
CPCC07G1/00C11B13/005C07J9/00Y02W30/74
Inventor WONG, ALFREDNORMAN, HUGH SVEN OSCARMACMILLAN, ANGUS KIRKE
Owner WONG ALFRED
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