发明名称 Process for preparing concentrated alkali metal hypochlorite solutions
摘要 The present invention relates to a process for preparing concentrated alkali metal hypochlorite solutions. One subject of the invention is more particularly a process for preparing concentrated bleach which may have a chlorine content of greater than 100 chlorometric degrees, and that has a low content of chlorates.
申请公布号 US9023236(B2) 申请公布日期 2015.05.05
申请号 US201113299599 申请日期 2011.11.18
申请人 Arkema France 发明人 Bossoutrot Jean-Michel
分类号 C11D3/395;C01B11/06 主分类号 C11D3/395
代理机构 Smith, Gambrell & Russell, LLP 代理人 Smith, Gambrell & Russell, LLP
主权项 1. Process for preparing a concentrated solution of an alkali metal hypochlorite by reacting chlorine and a solution of the corresponding alkali metal hydroxide, in the presence of alkali metal chloride crystals in which, in an essentially vertical vessel of volume “Vr”, the bottom part of which has a cross section smaller than the cross section of its top part: a) chlorine and an alkali metal hydroxide solution are injected into the bottom part, b) in the top part, the hypochlorite solution is withdrawn at a flow rate “Qs”, (i) one portion forms the concentrated hypochlorite solution produced, (ii) the other portion is recycled to the bottom part of the vessel, c) the alkali metal chloride crystals are purged close to the lower end of the bottom part of the vessel, d) the recycling and the injection of the reactants from step a) are adjusted so that the alkali metal chloride crystals are fluidized essentially in the bottom part of the vessel, and wherein the chlorates are present in an amount between 0.01% by weight and 0.2% by weight by carrying out the process under the conditions below: 0.01%<r*X*(100*M/ρ)<0.2% where r is the rate of reaction expressed in mol/l·s, where r=k [ClO−]2;k=k0*ⅇ-EaRT,  K0=7.91×1010 l/mol·s; Ea=1.05×105 J/mol, R=8.314472 J/mol.K, and T is the temperature of the reactor expressed in Kelvin; X is the residence time expressed in seconds, where X=Vr/Qs;M is the molar mass of sodium chlorate, i.e. 106.5 g/mol;ρ is the density of the solution expressed in g/l.
地址 Colombes FR