Continuous Extraction of Black Liquor Salts under Hydrothermal Conditions,Industrial & Engineering Chemistry Research

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Continuous Extraction of Black Liquor Salts under Hydrothermal Conditions
Industrial & Engineering Chemistry Research ( IF 3.8 ) Pub Date : 2021-03-02 , DOI: 10.1021/acs.iecr.0c05203
Runyu Wang _{1,

2} , Roger Deplazes _{1,

3} , Frédéric Vogel _{1,

4} , David Baudouin ₁

Affiliation

In hydrothermal valorization of black liquor (BL) from the Kraft process, the separation of inorganic salts is pivotal to prevent them from fouling downstream equipment such as reactors and for the cost-efficient recycling of salts into pulp cooking chemicals. In this work, the phase behavior of the inorganic salts present in BL was studied in supercritical water and the conditions for the separation from BL were optimized. A high-pressure differential scanning calorimetry study indicated the concomitant precipitation of salts and the formation of a second salt-rich liquid-like phase. The potassium-to-sodium ratio was found to strongly impact the phase behavior of the salt mixture. Potassium was found to prevent salt precipitation and to lead to the formation of a second liquid-like phase alone. At K/(K + Na) ≥ 0.4, a steady salt separation could be achieved, enabling the continuous extraction of up to 96% of the salts in a concentrated brine effluent.

中文翻译：

水热条件下黑色酒盐的连续萃取

在Kraft工艺中对黑液（BL）进行水热增值时，分离无机盐至关重要，这可以防止无机盐污染下游设备（如反应器），并使盐以成本效益的方式回收到纸浆蒸煮化学品中。在这项工作中，研究了在超临界水中BL中存在的无机盐的相行为，并优化了从BL中分离的条件。高压差示扫描量热法的研究表明，盐会随之沉淀，并形成第二个富盐液体状相。发现钾钠比强烈影响盐混合物的相行为。发现钾可防止盐沉淀并仅导致形成第二液体状相。在K /（K + Na）≥0.4时，

更新日期：2021-03-17

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