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Chlorine dioxide prodn. as part of paper paste mfr. - by reacting sodium chlorate with sodium sulphate and hydrochloric acid and removing the salt (BR270776)
Chlorine dioxide prodn. as part of paper paste mfr. - by reacting sodium chlorate with sodium sulphate and hydrochloric acid and removing the salt (BR270776)
In a process in which a paper paste is produced by contacting a cellulosic fibre with a paste forming liquor contg. Na2S and NaOH, sepg. the paste from the used liquor and regenerating the liquor to obtain a white liquor which is recycled as part of the liquor added to the fibres together with added Na2SO4 to compensate for the loss of soda and S, and bleaching using chlorine dioxide and purifying the paste, the ClO2 is formed by reacting NaClO3 with HCl in the presence of H2SO4 and a mixt. of NaCl and Na2SO4 is recovered, the Na2SO4 being used to supply the Na and the S as above. The amount of feedstock for making the ClO2 is reduced compared with prior art and since the NaCl is sepd. from the Na2SO4, no build up of salt occurs to produce a dead charge.
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机译:在通过使纤维素纤维与形成浆液的纸浆接触而生产纸浆的方法中,该浆液是连续的。 Na2S和NaOH,分离。废液中的糊状物,然后进行再生,得到白液,将其作为添加到纤维中的白液的一部分与添加的Na2SO4一起再循环,以补偿苏打和S的损失,并使用二氧化氯进行漂白并纯化糊状物,ClO2是通过使NaClO3与HCl在H2SO4和混合物存在下反应而形成的。回收NaCl和Na 2 SO 4中的Na 2 SO 4,如上所述,Na 2 SO 4用于提供Na和S。与现有技术相比,并且由于NaCl是分离的,所以用于制备ClO 2的原料的量减少了。由Na2SO4产生的盐不会产生死电荷。
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