Vitamin C clean production method

[0009] Embodiment 1: the sodium guronate solution that is made with existing technology method, add the concentrated sulfuric acid that mass fraction is 70% in sodium guronate solution, adjust solution pH to 3.5; Then the solution membrane ultrafiltration after above-mentioned adjustment pH , remove protein; add mass fraction in the solution after ultrafiltration and be 98.3% concentrated sulfuric acid, adjust pH to 1.65; Concentrate, crystallize, centrifuge and make gulong acid and Na after the solution of above-mentioned pH to 1.65 is decolorized with active carbon 2 SO 4 The mixed dry product; dissolve the above mixed dry product in methanol, wherein the feed ratio of mixed dry product and methanol is: every 1000kg mixed dry product is dissolved to 3m 3 The methanol solution of gulonic acid was filtered to obtain the methanol solution of gulong acid; finally, Vc-Na and Vc were prepared from the methanol solution of gulong acid by using the existing process steps.

[0010] Embodiment 2: the sodium guronate solution that is made with existing technology method, add the concentrated sulfuric acid that mass fraction is 98% in sodium guronate solution, adjust solution pH to 4; Then the solution membrane ultrafiltration after above-mentioned adjustment pH ; In the solution after ultrafiltration, add the concentrated sulfuric acid that mass fraction is 98%, adjust PH to 1.65; Concentrate, crystallize, centrifuge and make gulong acid and Na after the solution of above-mentioned PH to 1.65 2 SO 4 The mixed dry product; dissolve the above mixed dry product in methanol, wherein the feed ratio of mixed dry product and methanol is: every 1000kg mixed dry product is dissolved to 7m 3 The methanol solution of gulonic acid was filtered to obtain the methanol solution of gulong acid; finally, Vc-Na and Vc were prepared from the methanol solution of gulong acid by using the existing process steps.

[0011] Embodiment 3: the sodium guronate solution that is made with existing technology method, add the concentrated hydrochloric acid that mass fraction is 36% in sodium guronate solution, adjust solution pH to 3.0; Then the solution membrane ultrafiltration after above-mentioned adjustment pH Add concentrated hydrochloric acid with a mass fraction of 36% to the solution after ultrafiltration to adjust the pH to 1.6; decolorize the solution with the above pH to 1.6, concentrate, crystallize, and centrifuge to obtain a mixed dry product of gulong acid and NaCl; Dissolve the above mixed dry product in methanol, wherein the feed ratio of mixed dry product and methanol is: every 1000kg mixed dry product is dissolved to 6m 3 The methanol solution of gulonic acid was filtered to obtain the methanol solution of gulong acid; finally, Vc-Na and Vc were prepared from the methanol solution of gulong acid by using the existing process steps.