Some interesting questions about Sodium sulfate

Question 1:

Anhydrous sodium sulfate can be used to dry, directly added to the solution? How to choose the amount?

Right, you can directly add sodium sulfate to the solution. 142 grams anhydrous sodium sulfate can absorb 180 grams of water in theory, but I have done some experiments, found that sufficient absorbed water is a long process, it takes about 40 hours or more time. Different organic liquid with different quantity, such as toluene or solution difficult to dissolve in water, can add some less, (water can disappear).

Esters, slightly soluble in water, should also add some less, (water can disappear) but shall be placed for a period of time.

But alcohol, sodium sulfate (CAS NO: 7757-82-6) solution with most dehydration to 1% - 2% to the dewatering effect for high precision products can not.

In fact, for compounds with small measurement can be used instead of sodium sulfate, magnesium sulfate, because its water absorption capacity is stronger than sodium sulfate, it can also reduce the dosage and time. The salt water is proportional to the time, so the place a few hours is necessary. The general process of magnesium sulfate powder, even if the water is not sodium sulfate as a chunk, it exists as a small grain, so that the washing is easy to wash thoroughly.

Question 2:

How Anhydrous sodium sulfate to dry liquid?

We can not say that Anhydrous sodium sulfate dry the liquid, we can only say that the removal of organic liquid or gas in the water. The reason is that anhydrous sodium sulfate has water absorption.

1. Dry gas: anhydrous sodiumsulfate loading such as drying tube, the gas can be removed by water.

2. Removing the organic liquid water (such as alcohol): it can directly add anhydrous sodium sulfate into the solution, to filter solid water.

Questions 3:

Why not use anhydrous calcium chloride to dry volatile oil extraction, but anhydrous sodium sulfate?

Anhydrous calcium chloride as a desiccant is not suitable for treatment of organic matter, because anhydrous calcium chloride to form complexes with many organic compounds (alcohols, amines and aldehydes, ketones, esters). But Anhydrous sodium sulfate has no this problem. The main drawback is the drying efficiency is not high enough, the most suitable for preliminary drying.

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