An analysis of the reaction-diffusion mechanism governing the chlorination process of poly(vinyl chloride)

Barrière, Benoı̂t; Glotin, M.; Leibler, Ludwik

doi:10.1002/1099-0488(20001215)38:24<3201::aid-polb10>3.0.co;2-k

Cited by 9 publications

(4 citation statements)

References 16 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…In the photochlorination reaction of PVC to CPVC, one chlorine atom can be easily substituted inside each repeat unit (or “monomer”) of PVC; however, the rate of the second substitution in the repeat unit is significantly slower compared to the first addition . Only single chlorine substitution is considered as the main reaction for the simplicity of the model development.…”

Section: Resultsmentioning

confidence: 99%

“…41 = + Sh Re Sc 2.0 0.6( ) ( ) 0.5 0.33 (12) in which In the photochlorination reaction of PVC to CPVC, one chlorine atom can be easily substituted inside each repeat unit (or "monomer") of PVC; however, the rate of the second substitution in the repeat unit is significantly slower compared to the first addition. 42 Only single chlorine substitution is considered as the main reaction for the simplicity of the model development. In this chlorination process, the chlorine content in the polymer increases from its initial value of 56.8 wt % in the PVC but is limited to 73.2 wt % of the final CPVC (one chlorine added per repeat unit).…”

Section: Estimation Of the Liquid Film Massmentioning

confidence: 99%

See 1 more Smart Citation

Visible Blue LED Mediated Aqueous Photochlorination of PVC to CPVC: A Shrinking Core Kinetic Model and Experimental Study

Maity

Agrawal

Munshi

et al. 2023

Ind. Eng. Chem. Res.

View full text Add to dashboard Cite

The visible blue LED mediated aqueous suspension photochlorination of polyvinyl chloride (PVC) to chlorinated polyvinyl chloride (CPVC) is described. A shrinking core model (SCM) of the photochlorination process is proposed by considering diffusional resistances of chlorine gas at various steps involved in the photochlorination of PVC particles. Diffusion of Cl2 through the outer product layer contributes major resistance to the overall reaction, and this is the rate-controlling step. The proposed SCM model estimated values are in close agreement with the experimental data.

show abstract

Section: Resultsmentioning

confidence: 99%

Section: Estimation Of the Liquid Film Massmentioning

confidence: 99%

Visible Blue LED Mediated Aqueous Photochlorination of PVC to CPVC: A Shrinking Core Kinetic Model and Experimental Study

Maity

Agrawal

Munshi

et al. 2023

Ind. Eng. Chem. Res.

View full text Add to dashboard Cite

show abstract

“…The radiation time improves the peak reaction rate, but its influence becomes weaker when the time is longer than 40 s. The reaction temperature promotes the peak chlorination rate and the reaction after initiation. This phenomenon can be explained by the free radical mechanism [26][27][28], which assumes that the radical substitution is a chain reaction and composed of initiation (Reaction 3), propagation (Reactions 4 and 5), and termination (Reaction 6). A chlorine radical is generated in Reaction 3 and would participate in the chain propagation causing the substitution.…”

Section: Enhancement Effect Of One Single Uv Initiationmentioning

confidence: 99%

UV‐Enhanced Gas‐Solid Chlorination of Polyvinyl Chloride for Cleaner Production of Chlorinated Polyvinyl Chloride

et al. 2016

View full text Add to dashboard Cite

A vibrated-bed reactor with an online UV-Vis measuring system was established in order to reveal the dynamic process of UV-enhanced chlorination of polyvinyl chloride (PVC). Influences of temperature, radiation time, and interval time of intermittent initiation on chlorination process as well as the overlapping enhanced effect of adjacent UV radiations were analyzed. By properly controlling the intermittent UV radiation, one can obtain a considerable steady reaction rate during the chlorination process to avoid the temperature runaway due to over-accelerated reaction. Solid-state nuclear magnetic resonance identified the microstructure change of chlorinated PVC particles. The whiteness value after thermal aging was determined to uncover the relationship between thermal stability and doublebond content, where the results accorded with the related theory on polymer dehydrochlorination.

show abstract

“…A characteristic property of a sphere of gel is the presence of a steady point [24] , where both the polymer and the solvent velocity vanish. For a sphere, this point coincides with its center.…”

Section: Spherical Geometrymentioning

confidence: 99%

Mechano-chemical dynamics of active gels: interplay between spatial bistability and volume variations

Villain¹,

Borckmans

Métens

2011

Journal of the Mechanical Behaviour of Materials

View full text Add to dashboard Cite

The mechano-chemical dynamics of a spherical bead of gel immersed in an autocatalytic bistable chemical reaction are examined. The spheres exhibit autonomous volume selfoscillation dynamics. We present a multi-diffusional approach to a hydrodynamic theory of gels, and also evolution equations incorporating chemical processes.Local equilibrium is crucial to the derivation of hydrodynamic equations. The differential of the free energy of the polymeric matrix system with solvent and chemical solute species is Brought to you by | New York University Bobst Library Technical Services Authenticated Download Date | 5/30/15 1:10 PM Figure 2 Bifurcation diagram showing the concentration of c 1 at the center of the bead as a function of its radius for D = 2 × 10 -5 cm 2 /s, c 10 = 3.81 × 10 -4 M , c 20 = 4.38 × 10 -3 M , k a = 4.5 × 10 3 M -3 s -1 k b = 4.5 × 10 8 M -4 s -1 .The bistability range is between R inf = 0.0372 cm and R sup = 0.038 cm.

show abstract

An analysis of the reaction-diffusion mechanism governing the chlorination process of poly(vinyl chloride)

Cited by 9 publications

References 16 publications

Visible Blue LED Mediated Aqueous Photochlorination of PVC to CPVC: A Shrinking Core Kinetic Model and Experimental Study

Visible Blue LED Mediated Aqueous Photochlorination of PVC to CPVC: A Shrinking Core Kinetic Model and Experimental Study

UV‐Enhanced Gas‐Solid Chlorination of Polyvinyl Chloride for Cleaner Production of Chlorinated Polyvinyl Chloride

Mechano-chemical dynamics of active gels: interplay between spatial bistability and volume variations

Contact Info

Product

Resources

About