JinWang Jia"Records of Handicrafts · Yuanqiao Mountain": "There is a kingdom of Huanchang in the north, surrounded by sweet water, which tastes as sweet as honey."
2. Especially sweet drinks.
In Du Men Zhu Zhi Ci written by a young man in Qing Dynasty, "Long Tuan and Que Tongue recall each other in the air, and sweet water tastes bitter without fragrance."《Revealing Original Shape in Officialdom》The seventh time: "The other wines are Brandy, Weisige, red wine, Bud, champagne, with sweet water and salt water."
3. It refers to a happy day or a beautiful living environment.
Lao SheIn front of the third act of the appendix to Teahouse: "Bitter water goes, sweet water comes, and no one is a slave anymore."[1]
Chemical raw materials
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[Chemical industry]: sweet water from hydrology of oils and fats
also calledGlycerol water。GreaseObtained after layering of hydrolysateaqueous solution。The main useful ingredients areglycerolAnd its content is 10%~30%hydrolysisIs related to the process method.There may be someLow fatty acids、Decomposing agent、catalyzerAnd impurities in grease.throughpurifyAfter, you can go throughconcentrateanddistillationThe preparation of pure glycerin is more convenient than that of pure glycerin from soap making waste liquid. It is a good raw material for glycerin production.
The process route for extracting glycerin from sweet water is as follows: first, remove floating matters by sedimentation and separation; second, remove flocculent sediments by alkali neutralization,
Step 3: concentrate to crude glycerin, and step 4: distill to refined glycerin under reduced pressure[2]。
