Effect of shear, temperature and pH on the dynamics of salt induced coagulation of wood resin colloids

Lee, Roland; Stack, Karen; Richardson, Desmond; Lewis, Trevor; Garnier, Gil

doi:10.1016/j.colsurfa.2011.12.049

Cited by 20 publications

(9 citation statements)

References 44 publications

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“…It indicates an increased dissociation of the OH phen groups, which leads to a better solubility. At higher temperatures, the electrostatic repulsive forces are also higher, because more thermal energy is provided to the system (Lee et al 2012). …”

Section: Effects Of Ph Temperature and Ion Strengthmentioning

confidence: 99%

The molecular properties and carbohydrate content of lignins precipitated from black liquor

Zhu

Westman²,

Theliander³

2014

Holzforschung

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Precipitation and utilization of lignin from black liquor (BL) offers many promising advantages to modern kraft pulp mills. A novel process, known as "LignoBoost", has recently been introduced as a process for separating lignin from BL; it results in lignins with a low ash and high dry solid content. There is a lack of knowledge regarding the influences of process parameters on the behavior of lignin in the precipitation step. In this study, the yield of precipitated lignin and its average molecular weight (MWt) and carbohydrate content were the focus. Nuclear magnetic resonance (NMR) analysis showed that the lignin yield increased at lower pH and temperatures or when the ion strength of BL was elevated. High yield lignins contained more low MWt components and such lignins have more phenolic OH and methoxy groups. Xylan content of the lignins decreased with decreasing pH and increasing temperature, but glucomannan content was virtually unaffected by the conditions of precipitation.

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Section: Effects Of Ph Temperature and Ion Strengthmentioning

confidence: 99%

The molecular properties and carbohydrate content of lignins precipitated from black liquor

Zhu

Westman²,

Theliander³

2014

Holzforschung

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“…The critical coagulation pressure (CCP) for a particular gas is determined by fitting a straight line to the relatively linear 'transition zone' (figure 2a) of a plot of the logarithm of the stability ratio against the logarithm of the pressure of the gas and extrapolating to the x-axis, in a similar manner as that employed for the addition of salts as coagulants [12]. Similar work investigated the high-pressure coagulation of latex particles in which CCPs were defined [15].…”

Section: Resultsmentioning

confidence: 99%

Carbon dioxide pressure-induced coagulation of microalgae

Lee

Jessop

Champagne

2015

Phil. Trans. R. Soc. A.

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The move to a low-carbon economy has generated renewed interest in microalgae for the production of biofuels with the potential mutual benefit of wastewater treatment. However, harvesting has been identified as a limiting factor to the economic viability of this process. This paper explores the harvesting of microalgae using high-pressure gas without the addition of coagulants. Coagulation of microalgae under high-pressure gas was found to be an efficient method to separate algae from suspension. The critical coagulation pressures (CCPs) for H(2) and CO(2) were determined to be 6.1 and 6.2 MPa, respectively. The CO(2)-induced decrease in solution pH positively influenced coagulation rates, without appearing to affect the CCP. This approach could be beneficial for the economic removal of microalgae from solution for the production of both biofuels and biomedical compounds without the addition of non-environmentally friendly chemicals.

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“…Previous research has suggested that the thermal effects can influence the trajectory and kinetic characteristic of particles. Lee, Stack, Richardson, Lewis, and Garnier () investigated the effect of temperature on the dynamics of salt‐induced coagulation of wood resin colloids by using a photometric dispersion analyser. They discovered that temperature affected the critical coagulation concentration.…”

Section: Introductionmentioning

confidence: 99%

Experimental investigation of suspended particles transport in porous medium under variable temperatures

Cui

Fan

Wang

et al. 2019

Hydrological Processes

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This paper presents a study on suspended particle transport in porous medium with the aid of a sand layer transportation–deposition testing system to determine the kinetic characteristics of particles in porous medium under variable temperatures. Quartz sand and quartz powder were chosen as the porous medium and particle in the tests, respectively. Four size compositions and two operational modes, that is, temperature reduction mode (changing from 18°C to 5°C) and temperature increment mode (changing from 18°C to 35°C), were adopted. The turbidity and concentration of quartz powder were measured under various conditions. We observed a high temperature‐independent correlation between them. Breakthrough curves under different conditions were analysed using this testing system. The results showed that changes in temperature affected the particle transport process to some extent, and the degree of influence was closely related to the time moment of the temperature change onset. Moreover, we found a hysteresis phenomenon in the breakthrough curve under both temperature reduction and increment conditions. The results also indicated that the temperature effect was particularly significant for smaller particles. The typical curves to represent particle transport process under variable temperatures were put forward according to the results. To explain the test results, four factors, that is, water viscosity, adsorption effect, double layer force, and particle kinetic energy, were considered and categorized as promotion or constraining factors.

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Effect of shear, temperature and pH on the dynamics of salt induced coagulation of wood resin colloids

Cited by 20 publications

References 44 publications

The molecular properties and carbohydrate content of lignins precipitated from black liquor

The molecular properties and carbohydrate content of lignins precipitated from black liquor

Carbon dioxide pressure-induced coagulation of microalgae

Experimental investigation of suspended particles transport in porous medium under variable temperatures

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