CN88103797A - 不制冷,不蒸发磷酸二铵结晶新方法 - Google Patents
不制冷,不蒸发磷酸二铵结晶新方法 Download PDFInfo
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- CN88103797A CN88103797A CN88103797.4A CN88103797A CN88103797A CN 88103797 A CN88103797 A CN 88103797A CN 88103797 A CN88103797 A CN 88103797A CN 88103797 A CN88103797 A CN 88103797A
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- diammonium phosphate
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Abstract
本发明是结晶状,可溶性磷酸二铵生产法。
本发明的技术条件是在立式结晶塔内,实现一个NH3-H3PO4—H2O物系的过饱和状态,以便能迅速结晶,结晶物系的pH值在9—10之间。
Description
本发明是结晶状可溶性磷酸二铵生产法。
目前,世界范围内,就磷酸二铵的生产,均采用料浆造粒法,或管式反应造粒法,所用湿法磷酸浓度均采用40-54%P2O5、流程经过:预中和、二次洗涤、氨化造粒,干燥,破碎,返料,冷却等工序、设备投资大,构造复杂动力能耗高,如TVA流程西班牙克罗斯流程或雅各布斯-多科流程。
本发明旨在开发目前现有技术以外的方法,结晶磷酸二铵生产法,以求达到设备简单,降低成本的目的
本发明的工艺过程是:在两个串联的蛇管喷淋冷却器内,依次进行磷酸的二次氨化,第一次把氨酸分子比控制在0.6,第二次控制在1.4,温度均不高于75℃,经氨化后的溶液再送入立式带有搅拌装置的氨化结晶塔内,再次氨化,使反应物系NH3-H3PO4-H2O的PH值达到9-10之间,磷酸铵就结晶析出,结晶塔的外部用水帘冷却,结晶物系经离心分离即得磷酸二铵结晶产品,母液经处理循环使用。
本发明比目前TVA开发的流程,雅各布斯-多科流程或西班牙克罗斯流程的优点是,原料磷酸所用湿法酸不用浓缩,可以直接使用(22-32%P2O5)。设备简单,容易建造,生产过程能耗低,从而降低了生产成本与设备投资。
实施本发明很简便,取原料酸(22-32%P2O5)500克,液氨300克,分别通过转子流量计通入蛇管喷淋冷凝器内,氨酸分子比第一次控制在0.6,第二次通入的氨使其在第一次氨化的基础上控制氨酸分子比为1.4,经过两次氨化的物系NH3-H3PO4-H2O进入结晶塔内一次氨化到PH达到9-10之间,即有结晶形成,把结晶物系离心分离即得磷酸二铵结晶产品。
Claims (1)
- 不制冷、不蒸发磷酸二铵结晶新方法,其结晶特征是在立式结晶塔内,NH3-H3PO4-H2O物系中,PH值在9-10之间产生的,所用原料酸的浓度最低是22%P2O5。
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
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CN88103797.4A CN1006057B (zh) | 1988-06-25 | 1988-06-25 | 不制冷,不蒸发磷酸二铵结晶新方法 |
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CN88103797.4A CN1006057B (zh) | 1988-06-25 | 1988-06-25 | 不制冷,不蒸发磷酸二铵结晶新方法 |
Publications (2)
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CN88103797A true CN88103797A (zh) | 1988-12-28 |
CN1006057B CN1006057B (zh) | 1989-12-13 |
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CN88103797.4A Expired CN1006057B (zh) | 1988-06-25 | 1988-06-25 | 不制冷,不蒸发磷酸二铵结晶新方法 |
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Cited By (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
CN106345135A (zh) * | 2015-07-15 | 2017-01-25 | 中国石油化工股份有限公司 | 一种用于气相反应的结晶塔 |
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1988
- 1988-06-25 CN CN88103797.4A patent/CN1006057B/zh not_active Expired
Cited By (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
CN106345135A (zh) * | 2015-07-15 | 2017-01-25 | 中国石油化工股份有限公司 | 一种用于气相反应的结晶塔 |
CN106345135B (zh) * | 2015-07-15 | 2018-07-20 | 中国石油化工股份有限公司 | 一种用于气相反应的结晶塔 |
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Publication number | Publication date |
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CN1006057B (zh) | 1989-12-13 |
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