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Sodium sulphate removal from sulphur dioxide absorption medium - by treatment with dry gas contg. sulphur dioxide to reduce sodium loss

机译：从二氧化硫吸收介质中除去硫酸钠-通过用干燥气体进行处理。二氧化硫减少钠损失

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Removal of SO2 from a gas is achieved by absorption in an aq. Na2SO3 soln. forming NaHSO3, followed by desorption of SO2 to regenerate the absorbent, Na2SO4 being formed in the system. The Na2SO4 is removed by contacting (part of) the aq. medium contg. NaHSO3 less Na2SO4 and less or no Na2SO3 with a gas contg. SO2 and (at least 50%) unsatd. with water vapour, so that enough water evaporates to ppte. up to 20, pref. 1-10, esp. 3-7 wt % of the solids from the soln. The ppte. contg. Na2SO4 and soln. contg. NaHSO3 are then sepd. the soln. pref. being recycled to the SO2 desorption stage. The Na2SO4 formed as by-prod. is sepd. without excessive loss of valuable Na cpds. from the system. The soln. treated with the gas is the spent absorption soln. so that the ratio of the wt. of Na2SO4 to the sum of the wts. of Na2SO4, Na2SO3 and NaHSO3 in the ppte. is greater than and pref. at least twice as great as that of the absorption-desportion medium. Treatment is carried out at 40-70 degrees C. Desorption is carried out with a suspension of NaHSO4 soln. contg. 25% undissolved solids.

机译：通过在水溶液中吸收来实现从气体中去除SO2。 Na2SO3溶液。形成NaHSO3，然后将SO2解吸以再生吸收剂，系统中形成Na2SO4。通过接触（部分）水溶液来除去Na 2 SO 4。中续NaHSO3较少的Na2SO4，较少或没有Na2SO3，且有气续。 SO2和（至少50％）未饱和。用水蒸气蒸发，使足够的水蒸发至ppte。最多20个1-10，尤其是来自溶液的固体的3-7重量％。 ppte。续Na2SO4和soln。续然后分离NaHSO3。 soln。偏好循环到SO2解吸阶段。 Na2SO4作为副产物形成。是sepd。不会过多损失有价值的Na cpds。从系统。索恩用气体处理的是废吸收液。因此，重量比Na2SO4的总重量之和。 ppte中的Na2SO4，Na2SO3和NaHSO3含量。大于和优选。至少是吸收-分散介质的两倍大。在40-70℃下进行处理。用NaHSO4溶液的悬浮液进行解吸。续25％的不溶固体。

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公开/公告号DE2700553A1

专利类型
公开/公告日1977-07-14

原文格式PDF
申请/专利权人 DAVY POWERGAS INC.;
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申请/专利号DE19772700553
发明设计人 ELLSWORTH BAILEYEDGAR;FREDERICK FLINTOFFJOHN;MERRINGTON SCARLETTJOHN KIRK;ERIC NICHOLSONNORMAN;
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申请日1977-01-07
分类号B01D53/34;B01D53/14;
国家 DE
入库时间 2022-08-22 23:58:07

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