Sweet water is a byproduct mixture of water and glycerin obtained from fat splitting processes like enzymatic splitting and the Twitchell process. Sweet water contains 8-15% glycerin, has a pH below 5, and contains small amounts of salt, organic material, and ions. It can be purified by removing oily matter, concentrating the glycerin to 86-88% through evaporation, yielding crude glycerin. Crude glycerin has applications and potential can be used as a source for hydrogen, succinic acid, ethanol, and other compounds through fermentation or chemical reactions.

1. SWEET WATER (GLYCERINE- WATER MIX)
- Tarun Kataria (B.Tech-OOST)
By-product utilization & waste
management
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2. INTRODUCTION
 Sweet water consists of water and
glycerine
 Sweet water is obtained from fat
splitting processes such as-
1. Enzymatic splitting (atm)
2. Twitchell process
3. Pressure splitting- batch,
continuous & semi- continuous
 Glycerin is a neutral, sweet-tasting,
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3. HP process Gly content
(%)
pH Salt
content
(%)
Organic
content (%)
Ionic load
(mEq/l)
Twitchell 8-12 <2 0-0.2 0-2 50-200
High
pressure
10-15 4-5 0-0.2 0-2 20-100
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4. PURIFICATION OF SWEET WATER TO OBTAIN
GLYCERINE
 The Treatment Unit is
used to remove oily
matter and Fat.
 In Sweet Water
Concentration Unit,
treated SW is
processed to
recover crude
glycerine.
 By evaporation of
water, the glycerine
concentration
increases to 86 - 88%.
 Crude glycerine is 5

5. APPLICATIONS
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6. FUTURE PROSPECTS
 Hydrogen
 Succinic acid
 Ethanol
 Polypropylene
glycol
 Dihydroxyaceto
ne
 Acrolein
 Mono- & di- acyl
glycerols
Microbial fermentation
Rxn with adipic acid ( antifogging, antistatic
additive
Selective oxidation (tanning agent in cosmetics)
Fermentation – dehydroxylation( composites,
adhesives, laminates) ; clostridium butyricium
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