A Block Flow Diagram code in Mermaid code is proposed here below:

flowchart LR
    subgraph FEED["FEED PREPARATION"]
        A1[Ethylene Feed<br/>from EP-600] --> A2[Purification<br/>& Drying]
        A3[Solvent] 
    end
    
    subgraph CATALYST["CATALYST PREPARATION"]
        B1[Alkylaluminum] --> B2[Microwave<br/>Activation<br/>2.45 GHz]
        B3[Chromium<br/>Compound]
        B4[Pyrrole<br/>Ligand]
        B5[Zinc<br/>Compound]
        B2 --> B6[Catalyst<br/>Mixing]
        B3 --> B6
        B4 --> B6
        B5 --> B6
    end
    
    subgraph REACTION["TRIMERIZATION SECTION"]
        C1[Trimerization<br/>Reactor<br/>30-70 bar<br/>40-90°C]
        C2[Cooling<br/>System]
        C2 -.cooling.-> C1
    end
    
    subgraph QUENCH["CATALYST DEACTIVATION"]
        D1[Quench<br/>Vessel]
        D2[Deactivating<br/>Agent]
        D2 --> D1
    end
    
    subgraph RECYCLE["ETHYLENE RECOVERY"]
        E1[Flash Drum /<br/>Deethanizer]
        E2[Recycle<br/>Compressor]
    end
    
    subgraph SEPARATION["PRODUCT SEPARATION<br/>Split-Flow System"]
        F1{Flow<br/>Splitter}
        F2[Distillation<br/>Column<br/>Path A]
        F3[Evaporator<br/>Path B]
        F4[1-Hexene<br/>Product<br/>>99.7% purity]
        F5[Heavy<br/>Oligomers<br/>C8+]
    end
    
    subgraph STORAGE["PRODUCT & STORAGE"]
        G1[1-Hexene<br/>Storage<br/>50 kt/y]
        G2[Heavy Ends<br/>Collection]
    end
    
    A2 -->|Pure Ethylene| C1
    A3 -->|Solvent| C1
    B6 -->|Catalyst System| C1
    C1 -->|Reactor Effluent| D1
    D1 -->|Quenched Stream| E1
    E1 -->|Ethylene Vapor| E2
    E2 -->|Recycle Stream| A2
    E1 -->|Oligomer Product| F1
    F1 -->|Stream A| F2
    F1 -->|Stream B| F3
    F2 -->|Polymer-grade| F4
    F3 -->|Bulk Separation| F4
    F2 -->|Heavy Ends| F5
    F3 -->|Heavy Ends| F5
    F4 --> G1
    F5 --> G2
    
    style FEED fill:#e1f5ff
    style CATALYST fill:#fff4e1
    style REACTION fill:#ffe1e1
    style QUENCH fill:#f0e1ff
    style RECYCLE fill:#e1ffe1
    style SEPARATION fill:#ffe1f5
    style STORAGE fill:#f5f5f5
    style C1 fill:#ff9999
    style B2 fill:#ffcc99
    style F1 fill:#ff99cc