We determined the effects of different hydrothermal liquefaction (HTL) process variables (temperature, holding time, algae loading, and water loading) on 13 different elements in biocrude and the aqueous phase co-product. Reaction conditions included both fast and isothermal HTL. The concentrations of P, Mg, Na, and Ca in the biocrude had their highest values at the mildest HTL conditions explored, and the concentrations decreased precipitously as even moderate HTL conditions were used. The concentrations of Zn, Cu, and Ni do not show much variation with HTL severity, whereas the concentration of Fe in the biocrude first increases and then decreases. P and Na were the most abundant elements in the biocrude from fast HTL, but Fe was the most abundant from isothermal HTL. These results show that the HTL conditions can influence the concentrations of different metals and inorganic species in algal biocrude from HTL.

中文翻译：

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微藻快速等温水热液化中生物原油中的金属和其他元素

我们确定了不同的水热液化（HTL）工艺变量（温度，保持时间，藻类载量和水载量）对生物原油和水相副产物中13种不同元素的影响。反应条件包括快速和等温HTL。在研究的最温和的HTL条件下，生物粗品中P，Mg，Na和Ca的浓度具有最高值，即使使用中等HTL条件，其浓度也会急剧下降。Zn，Cu和Ni的浓度不会随HTL的严重程度显示出很大的变化，而生物粗品中的Fe的浓度则先升高然后降低。P和Na是快速HTL中生物原油中最丰富的元素，而Fe是等温HTL中最丰富的元素。