怎样把 iron (II) sulfate变去sulphuric acid

nobuta

各位请帮帮忙， 我现在上工要做sulphuric acid 的titration。可是那sulphuric acid已经掺了iron，导致sulphuric acid 变成iron (II) sulfate(青色的solution).

我要用什么方法把它变回sulphuric acid 呢？

请各位救救我！

TonyDaisie

[quote]原帖由 nobuta 于 20-3-2008 04:27 PM 发表
各位请帮帮忙， 我现在上工要做sulphuric acid 的titration。可是那sulphuric acid已经掺了iron，导致sulphuric acid 变成iron (II) sulfate(青色的solution).

Fe + H2SO4 = FeSO4 + H2
Iron + Sul Acid = Iron Sulphate + Hydrogen

reaction 是reversible的。所以答案是加hydrogen......
我建议用新的acids,因为hydrogen的气贵又危险。

奇仔

A process for the recovery of sulfuric acid from waste sulfuric acid containing iron sulfate and from solid iron sulfate of high water content of crystallization which consists essentially of:
A. concentrating waste sulfuric acid to an acid concentration of 25-55 weight percent, based upon the suspension, by removing water therefrom;

B. mixing the concentrated acid of Step A with recycled concentrated sulfuric acid obtained from Step E to form a resultant acid mixture of acid concentration of 30-65 weight percent, based upon the suspension;

C. adding said solid iron sulfate of high water content of crystallization to the acid mixture of Step B thereby obtaining iron sulfate of low water content of crystallization;

D. separating the iron sulfate of low water content from the resultant sulfuric acid solution of Step C;

E. concentrating the separated sulfuric acid solution of Step D to an acid concentration of 45-70 weight percent, based on salt-free acid, and recycling at least a portion thereof to Step B; and

F. thermally decomposing the iron sulfate from Step D to produce iron oxide and sulfur dioxide.

具体的步骤请参考 http://www.freepatentsonline.com/4163047.html